CVE-2026-0300
📛 CVE Title
PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal
Description
A buffer overflow vulnerability in the User-ID™ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. The risk of this issue is greatly reduced if you secure access to the User-ID™ Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses. Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- palo_alto
- CVSS severity
- CRITICAL
- CVSS score
- 9.3 / 10
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/AU:Y/R:U/V:C/RE:M/U:Red- Effective score
- 9.3 / 10 CRITICAL source: CNA overview
- CWE(s)
-
CWE-787 - Reserved
- 2025-11-03
- Published
- 2026-05-06 18:57 UTC
- Last updated
- 2026-05-12 12:08 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/0xxx/CVE-2026-0300.json
- Linked Threat
- CVE-2026-0300 — PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal
CISA Known Exploited Vulnerabilities CISA KEV
CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.
- Vulnerability name
- Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability
- Vendor / project
- Palo Alto Networks
- Product
- PAN-OS
- Date added to KEV
- 2026-05-06
- Remediation due
- 2026-05-09
- Required action
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Until the vendor releases an official fix, the following workaround should be implemented: - Restrict User-ID Authentication Portal access to only trusted zones. - Disable User-ID Authentication Portal if not required. 5/13/2026: Palo Alto has released a variety of patches. If these are relevant to your environment, please apply the designated patch.
- Ransomware campaign use
- Unknown
- CISA notes
- https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300
- CISA listing
- www.cisa.gov/known-exploited-vulnerabilities-catalog
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-06 19:16:35 UTC
- NVD last modified
- 2026-05-12 18:47:21 UTC
- NVD CVSS v3.1
- 9.8 / 10 CRITICAL source: nvd@nist.gov
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Exploitability subscore
- 3.9 / 10
- Impact subscore
- 5.9 / 10
- EPSS score
- 0.0435 (probability of exploitation in next 30 days)
- EPSS percentile
- 89.06% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD / KEV / EPSS data refreshed 2026-05-25 04:49 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-27879 - Assigner
- palo_alto
- Published
- May 6, 2026, 6:57:39 PM
- Updated
- May 12, 2026, 12:08:45 PM
- EUVD base score (CVSS 4.0)
-
9.3 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/AU:Y/R:U/V:C/RE:M/U:Red - EUVD-reported EPSS
- 4.5400
- Vendors
- Palo Alto Networks
- Products
-
Prisma AccessPAN-OS (11.1.0 <11.1.15)PAN-OS (11.2.0 <11.2.12, 11.2.10-h6, 11.2.7-h13, 11.2.4-h17)PAN-OS (12.1.0 <12.1.7)PAN-OS (12.1.0 <12.1.7, 12.1.4-h5)Cloud NGFWPAN-OS (10.2.0 <10.2.18-h6, 10.2.16-h7, 10.2.13-h21, 10.2.10-h36, 10.2.7-h34)PAN-OS (11.2.0 <11.2.12)PAN-OS (10.2.0 <10.2.18-h6)PAN-OS (11.1.0 <11.1.15, 11.1.13-h5, 11.1.10-h25, 11.1.7-h6, 11.1.6-h32, 11.1.4-h33)
ENISA description: A buffer overflow vulnerability in the User-ID™ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. The risk of this issue is greatly reduced if you secure access to the User-ID™ Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses. Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.
EUVD references (1)
Affected products (3)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Palo Alto Networks | Cloud NGFW |
All (unaffected)
|
— |
| Palo Alto Networks | PAN-OS |
12.1.0 (affected),
11.2.0 (affected),
11.1.0 (affected),
10.2.0 (affected)
|
— |
| Palo Alto Networks | Prisma Access |
All (unaffected)
|
— |
Affected products — CPE 2.3 (211) NVD
NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.
cpe:2.3:o:paloaltonetworks:pan-os:10.2.0:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.1:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.2:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.3:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.4:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.5:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.6:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h1:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h12:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h16:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h19:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h21:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h24:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h3:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h32:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h6:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h8:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.8:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.9:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h10:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h12:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h14:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h17:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h18:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h2:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h21:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h27:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h3:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h30:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h31:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h4:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h5:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h7:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h9:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.11:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.12:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h1:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h10:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h16:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h18:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h2:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h3:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h4:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h5:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h7:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.14:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.15:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.16:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.16:h1:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.16:h4:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.16:h6:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.17:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.18:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.18:h1:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.18:h5:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.0:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.1:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.2:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.3:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h1:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h13:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h15:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h16:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h17:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h18:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h25:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h27:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h32:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h4:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h7:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h9:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.5:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h1:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h10:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h14:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h17:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h19:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h2:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h20:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h21:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h22:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h23:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h25:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h29:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h3:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h4:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h5:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h6:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h7:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.7:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.7:h1:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.7:h2:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.7:h4:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.8:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.9:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h1:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h10:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h12:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h21:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h4:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h5:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h7:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.10:h9:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.11:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.12:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.13:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.13:h1:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.13:h2:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.13:h3:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.1.14:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.0:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.1:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.2:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.3:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h1:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h10:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h11:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h12:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h14:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h15:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h2:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h4:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h5:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h6:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h7:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h8:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.4:h9:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.5:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.6:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h1:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h10:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h11:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h12:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h2:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h3:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h4:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h7:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.7:h8:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.8:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.9:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.10:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.10:h1:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.10:h2:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.10:h3:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.10:h4:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.10:h5:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:11.2.11:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:12.1.2:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:12.1.3:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:12.1.4:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:12.1.4:h2:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:12.1.4:h3:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:12.1.5:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:12.1.6:-:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-1410:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-1420:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-3410:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-3420:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-3430:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-3440:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-410:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-410r:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-410r-5g:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-415:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-415-5g:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-440:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-445:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-450:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-450r:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-450r-5g:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-455:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-455-5g:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-455r-5g:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-460:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-501:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-505:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-510:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-520:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-540:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-5410:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-5420:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-5430:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-5440:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-5445:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-545-poe:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-5450:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-550:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-5540:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-555-poe:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-5550:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-5560:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-5570:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-5580:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-560:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-7500:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:pa-7500-dpc-a:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:vm-100:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:vm-300:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:vm-50:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:vm-500:-:*:*:*:*:*:*:*cpe:2.3:h:paloaltonetworks:vm-700:-:*:*:*:*:*:*:*cpe:2.3:o:siemens:ruggedcom_ape1808_firmware:-:*:*:*:*:*:*:*cpe:2.3:h:siemens:ruggedcom_ape1808:-:*:*:*:*:*:*:*
Vendor references (1)
References embedded in the original CVE record by the assigning CNA.
- https://security.paloaltonetworks.com/CVE-2026-0300 vendor-advisory
Web references (27)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://www.theregister.com/cyber-crime/2026/06/01/palo-alto-vpn-bug-graduates-from-advisory-to-active-exploitation/5249114 tenable:www.theregister.com
- https://www.proofpoint.com/us/blog/threat-insight/more-cves-same-playbook-2026-vulnerability-exploitation-wild tenable:www.proofpoint.com
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-27879 rapid7:euvd.enisa.europa.eu
- https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000CqbiCAC rapid7:knowledgebase.paloaltonetworks.com
- http://cwe.mitre.org/data/definitions/787.html rapid7:cwe.mitre.org
- https://attackerkb.com/topics/CVE-2026-0300 rapid7:attackerkb.com
- https://nvd.nist.gov/vuln/detail/CVE-2026-0300 tenable:nvd.nist.gov
- https://security.paloaltonetworks.com/CVE-2026-0300 tenable:security.paloaltonetworks.com
- https://securityaffairs.com/191748/security/palo-alto-networks-pan-os-flaw-exploited-for-remote-code-execution.html tenable:securityaffairs.com
- https://securityaffairs.com/191780/security/u-s-cisa-adds-a-flaw-in-palo-alto-networks-pan-os-to-its-known-exploited-vulnerabilities-catalog.html tenable:securityaffairs.com
- https://securityaffairs.com/191831/security/nation-state-actors-exploit-palo-alto-pan-os-zero-day-for-weeks.html tenable:securityaffairs.com
- https://thehackernews.com/2026/05/palo-alto-pan-os-flaw-under-active.html tenable:thehackernews.com
- https://thehackernews.com/2026/05/pan-os-rce-exploit-under-active-use.html tenable:thehackernews.com
- https://therecord.media/palo-alto-warns-of-critical-software-bug-firewalls tenable:therecord.media
- https://unit42.paloaltonetworks.com/captive-portal-zero-day/ tenable:unit42.paloaltonetworks.com
- https://www.bleepingcomputer.com/news/security/palo-alto-networks-warns-of-actively-exploited-firewall-zero-day/ tenable:www.bleepingcomputer.com
- https://www.bleepingcomputer.com/news/security/pan-os-firewall-rce-zero-day-exploited-in-attacks-since-april-9/ tenable:www.bleepingcomputer.com
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0300 tenable:www.cisa.gov
- https://www.cisa.gov/news-events/alerts/2026/05/06/cisa-adds-one-known-exploited-vulnerability-catalog tenable:www.cisa.gov
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-139-02 tenable:www.cisa.gov
- https://www.cve.org/CVERecord?id=CVE-2026-0300 tenable:www.cve.org
- https://www.databreachtoday.com/palo-alto-firewalls-being-exploited-no-patch-yet-available-a-31612 tenable:www.databreachtoday.com
- https://www.first.org/epss/ tenable:www.first.org
- https://cyberscoop.com/palo-alto-networks-pan-os-firewall-zero-day-vulnerability-exploited/ tenable:cyberscoop.com
- https://www.securityweek.com/palo-alto-networks-to-patch-zero-day-exploited-to-hack-firewalls/ tenable:www.securityweek.com
- https://www.securityweek.com/palo-alto-zero-day-exploited-in-campaign-bearing-hallmarks-of-chinese-state-hacking/ tenable:www.securityweek.com
- https://cert-portal.siemens.com/productcert/html/ssa-967325.html tenable:cert-portal.siemens.com
NVD-tagged references (3)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://cert-portal.siemens.com/productcert/html/ssa-967325.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e Third Party Advisory
- https://security.paloaltonetworks.com/CVE-2026-0300 psirt@paloaltonetworks.com MitigationVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0300 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource
Indicators (2)
IOCs linked to the auto-promoted Threat row.
| Type | Value | VirusTotal | Attached |
|---|---|---|---|
| cve |
CVE-2026-0300
|
no local data | 2026-05-14 02:58 UTC |
| cwe |
CWE-787
|
no local data | 2026-05-14 02:58 UTC |
Remediations (9)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:www.wiz.io
Detect and mitigate CVE-2026-0300 , a critical vulnerability in Palo Alto Networks PAN-OS User-ID Authentication Portal that allows unauthenticated attackers to achieve remote code execution (RCE) with root privileges.
2026-05-14 06:47 UTC -
web:cybersecuritynews.com
Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.
2026-05-14 06:47 UTC -
web:dailysecurityreview.com
Palo Alto Networks disclosed CVE-2026-0300 on May 6, 2026 — a CVSS 9.3 unauthenticated buffer overflow in PAN-OS Captive Portal actively exploited in the wild. No patch until May 13; interim mitigation is restricting portal access to trusted zones.
2026-05-14 06:47 UTC -
web:github.com
CVE-2026-0300 . Contribute to 0xBlackash/ CVE - 2026 - 0300 development by creating an account on GitHub.
2026-05-14 06:47 UTC -
web:socprime.com
Palo Alto warns CVE-2026-0300 can let attackers gain root RCE on exposed PAN-OS firewalls. See impact and mitigation
2026-05-14 06:47 UTC -
web:threatprotect.qualys.com
CISA urges users to patch the vulnerability before May 9, 2026 . The Palo Alto Networks User-ID Authentication Portal (formerly known as Captive Portal) is a PAN-OS security feature that authenticates users when the firewall cannot automatically map their IP addresses to identities.
2026-05-14 06:47 UTC -
web:cybelangel.com
CISA added CVE-2026-0300 to its KEV catalog on May 6 with a three-day remediation deadline for federal agencies, and no patch exists until May 13 at the earliest. For security teams running PA-Series or VM-Series firewalls with the User-ID Authentication Portal enabled, this is an active incident — not a scheduled patching task.
2026-05-14 06:47 UTC -
web:www.kodemsecurity.com
What Happened: Palo Alto Discloses CVE-2026-0300 in PAN-OS Captive Portal CVE-2026-0300 is a critical severity (CVSS 9.3) buffer overflow in the PAN-OS User-ID Authentication Portal (Captive Portal) that allows unauthenticated remote code execution as root on PA-Series and VM-Series firewalls. Palo Alto Networks confirmed active in-the-wild exploitation before the full patch slate was available.
2026-05-14 06:47 UTC -
CISA KEV
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Until the vendor releases an official fix, the following workaround should be implemented: - Restrict User-ID Authentication Portal access to only trusted zones. - Disable User-ID Authentication Portal if not required. 5/13/2026: Palo Alto has released a variety of patches. If these are relevant to your environment, please apply the designated patch. Due date: 2026-05-09 Known ransomware campaign use: Unknown
2026-05-14 01:13 UTC
AI Forensic Analysis
Only Available for Registered Users. Sign in to view.
Raw JSON
The full cvelistV5 record. Download as CVE-2026-0300.json.
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"orgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0",
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"url": "https://security.paloaltonetworks.com/CVE-2026-0300"
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],
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],
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{
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"title": "PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID\u2122 Authentication Portal",
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}
],
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"cveMetadata": {
"assignerOrgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0",
"assignerShortName": "palo_alto",
"cveId": "CVE-2026-0300",
"datePublished": "2026-05-06T18:57:39.876Z",
"dateReserved": "2025-11-03T20:44:58.173Z",
"dateUpdated": "2026-05-12T12:08:45.523Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}