CVE-2026-0257
📛 CVE Title
PAN-OS: GlobalProtect Authentication Bypass Vulnerabilities
Description
Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection. Panorama and Cloud NGFW are not impacted by these issues.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- palo_alto
- CVSS severity
- MEDIUM
- CVSS score
- 4.7 / 10
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:U/AU:N/R:A/V:D/RE:M/U:Amber- Effective score
- 4.7 / 10 MEDIUM source: CNA overview
- CWE(s)
-
CWE-565 - Reserved
- 2025-11-03
- Published
- 2026-05-13 18:15 UTC
- Last updated
- 2026-05-13 18:59 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/0xxx/CVE-2026-0257.json
- Linked Threat
- CVE-2026-0257 — PAN-OS: GlobalProtect Authentication Bypass Vulnerabilities
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
- 2026-05-13 19:17:01 UTC
- NVD last modified
- 2026-05-14 16:21:23 UTC
- EPSS score
- 0.0006 (probability of exploitation in next 30 days)
- EPSS percentile
- 20.16% 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-2026-30104 - Assigner
- palo_alto
- Published
- May 13, 2026, 6:15:10 PM
- Updated
- May 30, 2026, 3:55:17 AM
- EUVD base score (CVSS 4.0)
-
7.8 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:A/AU:N/R:A/V:D/RE:M/U:Red - EUVD-reported EPSS
- 41.5100
- Vendors
- Palo Alto Networks
- Products
-
Prisma Access (11.2.0 <11.2.7-h13)PAN-OS (11.2.0 <11.2.12, 11.2.10-h7, 11.2.7-h14, 11.2.4-h17)PAN-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 (12.1.0 <12.1.7, 12.1.4-h6)Prisma Access (10.2.0 <10.2.10-h36)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)Cloud NGFW
ENISA description: Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection. Panorama and Cloud NGFW are not impacted by these issues.
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 |
10.2.0 (affected),
11.2.0 (affected)
|
— |
Vendor references (1)
References embedded in the original CVE record by the assigning CNA.
- https://security.paloaltonetworks.com/CVE-2026-0257 vendor-advisory
Web references (18)
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://thehackernews.com/2026/05/pan-os-globalprotect-authentication.html tenable:thehackernews.com
- https://www.bleepingcomputer.com/news/security/palo-alto-globalprotect-vpn-auth-bypass-flaw-now-exploited-in-attacks/ tenable:www.bleepingcomputer.com
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0257 tenable:www.cisa.gov
- https://www.cisa.gov/news-events/alerts/2026/05/29/cisa-adds-one-known-exploited-vulnerability-catalog tenable:www.cisa.gov
- https://www.darkreading.com/threat-intelligence/patch-palo-alto-auth-bypass-bug-exploit tenable:www.darkreading.com
- https://www.infosecurity-magazine.com/news/palo-alto-highseverity-bug/ tenable:www.infosecurity-magazine.com
- https://www.securityweek.com/recent-palo-alto-networks-vulnerability-exploited-for-weeks/ tenable:www.securityweek.com
- https://cyberscoop.com/palo-alto-networks-cve-2026-0257-exploited-vulnerability/ tenable:cyberscoop.com
- https://securityaffairs.com/192933/security/cve-2026-0257-rapid7-caught-attackers-abusing-forged-vpn-cookies-against-multiple-customers.html tenable:securityaffairs.com
- https://securityaffairs.com/192951/security/u-s-cisa-adds-palo-alto-networks-pan-os-flaw-to-its-known-exploited-vulnerabilities-catalog.html tenable:securityaffairs.com
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30104 rapid7:euvd.enisa.europa.eu
- https://attackerkb.com/topics/CVE-2026-0257 rapid7:attackerkb.com
- http://cwe.mitre.org/data/definitions/565.html rapid7:cwe.mitre.org
- https://www.cve.org/CVERecord?id=CVE-2026-0257 tenable:www.cve.org
- https://nvd.nist.gov/vuln/detail/CVE-2026-0257 tenable:nvd.nist.gov
- https://www.first.org/epss/ tenable:www.first.org
- https://security.paloaltonetworks.com/CVE-2026-0257 tenable:security.paloaltonetworks.com
NVD-tagged references (1)
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://security.paloaltonetworks.com/CVE-2026-0257 psirt@paloaltonetworks.com
Indicators (2)
IOCs linked to the auto-promoted Threat row.
| Type | Value | VirusTotal | Attached |
|---|---|---|---|
| cve |
CVE-2026-0257
|
no local data | 2026-05-14 09:33 UTC |
| cwe |
CWE-565
|
no local data | 2026-05-30 02:00 UTC |
Remediations (14)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:app.opencve.io
Remediation No vendor fix or workaround currently provided. OpenCVE Recommended Actions Upgrade PAN‑OS to a fixed version per the vendor advisory, such as 12.1.7 or later, 11.2.12 or later, 11.1.15 or later, 10.2.18 or later, or the latest supported release for Prisma Access.
2026-05-23 21:35 UTC -
web:cvefeed.io
Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection. Panorama and Cloud NGFW are not impacted by these issues.
2026-05-23 21:35 UTC -
web:cybersecuritynews.com
Microsoft released an out-of-band hotpatch update on March 13, 2026 , addressing serious security vulnerabilities in Windows 11 versions 24H2 and 25H2.
2026-05-23 21:35 UTC -
web:krebsonsecurity.com
Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.
2026-05-23 21:35 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-05-23 21:35 UTC -
web:securitricks.com
CVE CVE-2026-0257 - Score : 4.7 - Source : psirt@paloaltonetworks.com - Description : Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection. Panorama and Cloud NGFW are not impacted by these issues. - Tags : psirt@paloaltonetworks.com ...
2026-05-23 21:35 UTC -
web:security.paloaltonetworks.com
Palo Alto Networks Security Advisory: CVE-2026-0257 PAN-OS: GlobalProtect Authentication Bypass Vulnerabilities Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection. Panorama and Cloud NGFW are not impacted by these issues.
2026-05-23 21:35 UTC -
web:stack.watch
CVE-2026-0257 Published on May 13, 2026 PAN-OS: GlobalProtect Authentication Bypass Vulnerabilities Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection.
2026-05-23 21:35 UTC -
web:www.thehackerwire.com
CVE-2026-0257 is a Info severity vulnerability (CVSS 0). Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass...
2026-05-23 21:35 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-05-23 21:35 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. Due date: 2026-06-01 Known ransomware campaign use: Unknown
2026-05-30 01:59 UTC -
web:feedly.com
The patch for CVE - 2026 -0300 shipped on May 13, the same day Palo Alto published the Defender's Guide claiming twenty-six AI-credited findings with none exploited in the wild.
2026-05-17 02:24 UTC -
web:www.bleepingcomputer.com
Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.
2026-05-17 02:24 UTC -
web:www.tenable.com
Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection. Panorama and Cloud NGFW are not impacted by these issues.
2026-05-17 02:24 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-0257.json.
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"value": "<table class=\"tbl\"><thead><tr><th>Version<br></th><th>Minor Version<br></th><th>Suggested Solution<br></th></tr></thead><tbody><tr><td>Cloud NGFW All<br></td><td></td><td>No action needed.</td></tr><tr>\n <td>PAN-OS 12.1<br></td>\n <td>12.1.5 through 12.1.6</td>\n <td>Upgrade to 12.1.7 or later.</td>\n </tr><tr>\n <td></td>\n <td>12.1.2 through 12.1.4-h*</td>\n <td>Upgrade to 12.1.4-h6 or 12.1.7 or later.</td>\n </tr><tr>\n <td>PAN-OS 11.2<br></td>\n <td>11.2.11 or later</td>\n <td>Upgrade to 11.2.12 or later.</td>\n </tr><tr>\n <td></td>\n <td>11.2.8 through 11.2.10-h*</td>\n <td>Upgrade to 11.2.10-h7 or 11.2.12 or later.</td>\n </tr><tr>\n <td></td>\n <td>11.2.5 through 11.2.7-h*</td>\n <td>Upgrade to 11.2.7-h14 or 11.2.12 or later.</td>\n </tr><tr>\n <td></td>\n <td>11.2.0 through 11.2.4-h*</td>\n <td>Upgrade to 11.2.4-h17 or 11.2.12 or later.</td>\n </tr><tr>\n <td>PAN-OS 11.1<br></td>\n <td>11.1.14 or later</td>\n <td>Upgrade to 11.1.15 or later.</td>\n </tr><tr>\n <td></td>\n <td>11.1.11 through 11.1.13-h*</td>\n <td>Upgrade to 11.1.13-h5 or 11.1.15 or later.</td>\n </tr><tr>\n <td></td>\n <td>11.1.8 through 11.1.10-h*</td>\n <td>Upgrade to 11.1.10-h25 or 11.1.15 or later.</td>\n </tr><tr>\n <td></td>\n <td>11.1.7 through 11.1.7-h*</td>\n <td>Upgrade to 11.1.7-h6 or 11.1.15 or later.</td>\n </tr><tr>\n <td></td>\n <td>11.1.5 through 11.1.6-h*</td>\n <td>Upgrade to 11.1.6-h32 or 11.1.15 or later.</td>\n </tr><tr>\n <td></td>\n <td>11.1.0 through 11.1.4-h*</td>\n <td>Upgrade to 11.1.4-h33 or 11.1.15 or later.</td>\n </tr><tr>\n <td>PAN-OS 10.2<br></td>\n <td>10.2.17 through 10.2.18-h*</td>\n <td>Upgrade to 10.2.18 or 10.2.18-h6 or later.</td>\n </tr><tr>\n <td></td>\n <td>10.2.14 through 10.2.16-h*</td>\n <td>Upgrade to 10.2.16-h7 or 10.2.18 or later.</td>\n </tr><tr>\n <td></td>\n <td>10.2.11 through 10.2.13-h*</td>\n <td>Upgrade to 10.2.13-h21 or 10.2.18 or later.</td>\n </tr><tr>\n <td></td>\n <td>10.2.8 through 10.2.10-h*</td>\n <td>Upgrade to 10.2.10-h36 or 10.2.18 or later.</td>\n </tr><tr>\n <td></td>\n <td>10.2.0 through 10.2.7-h*</td>\n <td>Upgrade to 10.2.7-h34 or 10.2.18 or later.</td>\n </tr><tr><td>All older<br>unsupported<br>PAN-OS versions</td><td> </td><td>Upgrade to a supported fixed version.</td></tr><tr>\n <td>Prisma Access 10.2<br></td>\n <td>10.2.0 through 10.2.10-h*</td>\n <td>Upgrade to 10.2.10-h36 or later.</td>\n </tr><tr>\n <td>Prisma Access 11.2<br></td>\n <td>11.2.0 through 11.2.7-h*</td>\n <td>Upgrade to 11.2.7-h13 or later.<br></td>\n </tr></tbody></table><p><b>Note</b>: With this fix, if the firewall is configured to use an authentication override cookie for the GlobalProtect Portal or Gateway, it will regenerate the cookie using a more secure method. Therefore, GP users will need to re-authenticate after a PAN-OS upgrade, even if a valid cookie is present. This is a one time requirement. Once they re-authenticate after the upgrade, the authentication override cookie and its validity will work as they do today.</p>"
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"value": "VERSION MINOR VERSION SUGGESTED SOLUTION\nCloud NGFW All No action needed.\nPAN-OS 12.1 12.1.5 through 12.1.6 Upgrade to 12.1.7 or later.\n 12.1.2 through 12.1.4-h* Upgrade to 12.1.4-h6 or 12.1.7 or later.\nPAN-OS 11.2 11.2.11 or later Upgrade to 11.2.12 or later.\n 11.2.8 through 11.2.10-h* Upgrade to 11.2.10-h7 or 11.2.12 or later.\n 11.2.5 through 11.2.7-h* Upgrade to 11.2.7-h14 or 11.2.12 or later.\n 11.2.0 through 11.2.4-h* Upgrade to 11.2.4-h17 or 11.2.12 or later.\nPAN-OS 11.1 11.1.14 or later Upgrade to 11.1.15 or later.\n 11.1.11 through 11.1.13-h* Upgrade to 11.1.13-h5 or 11.1.15 or later.\n 11.1.8 through 11.1.10-h* Upgrade to 11.1.10-h25 or 11.1.15 or later.\n 11.1.7 through 11.1.7-h* Upgrade to 11.1.7-h6 or 11.1.15 or later.\n 11.1.5 through 11.1.6-h* Upgrade to 11.1.6-h32 or 11.1.15 or later.\n 11.1.0 through 11.1.4-h* Upgrade to 11.1.4-h33 or 11.1.15 or later.\nPAN-OS 10.2 10.2.17 through 10.2.18-h* Upgrade to 10.2.18 or 10.2.18-h6 or later.\n 10.2.14 through 10.2.16-h* Upgrade to 10.2.16-h7 or 10.2.18 or later.\n 10.2.11 through 10.2.13-h* Upgrade to 10.2.13-h21 or 10.2.18 or later.\n 10.2.8 through 10.2.10-h* Upgrade to 10.2.10-h36 or 10.2.18 or later.\n 10.2.0 through 10.2.7-h* Upgrade to 10.2.7-h34 or 10.2.18 or later.\nAll older Upgrade to a supported fixed version.\nunsupported\nPAN-OS versions\nPrisma Access 10.2 10.2.0 through 10.2.10-h* Upgrade to 10.2.10-h36 or later.\nPrisma Access 11.2 11.2.0 through 11.2.7-h* Upgrade to 11.2.7-h13 or later.\n\nNote: With this fix, if the firewall is configured to use an authentication override cookie for the GlobalProtect Portal or Gateway, it will regenerate the cookie using a more secure method. Therefore, GP users will need to re-authenticate after a PAN-OS upgrade, even if a valid cookie is present. This is a one time requirement. Once they re-authenticate after the upgrade, the authentication override cookie and its validity will work as they do today."
}
],
"source": {
"discovery": "INTERNAL"
},
"timeline": [
{
"lang": "en",
"time": "2026-05-13T16:00:00.000Z",
"value": "Initial publication."
}
],
"title": "PAN-OS: GlobalProtect Authentication Bypass Vulnerabilities",
"workarounds": [
{
"lang": "eng",
"supportingMedia": [
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"value": "<p><span>Customers can mitigate the risk of this issue by taking any of the following actions:</span></p><p></p><ul><li><span><b><span>Use a dedicated certificate for </span>Authentication Override cookies:</b> </span><span>Generate a new certificate exclusively for authentication override cookies and store it securely. Do not reuse the portal or gateway certificate, and do not share this certificate with other features or users.</span></li><li><span><b>Disable Authentication Override:</b></span><span> Uncheck the Authentication Override options (for generating and accepting cookies) in the GlobalProtect portal and gateway configuration.</span></li></ul><p></p>"
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],
"value": "Customers can mitigate the risk of this issue by taking any of the following actions:\n\n\n\n * Use a dedicated certificate for Authentication Override cookies: Generate a new certificate exclusively for authentication override cookies and store it securely. Do not reuse the portal or gateway certificate, and do not share this certificate with other features or users.\n * Disable Authentication Override: Uncheck the Authentication Override options (for generating and accepting cookies) in the GlobalProtect portal and gateway configuration."
}
],
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"assignerShortName": "palo_alto",
"cveId": "CVE-2026-0257",
"datePublished": "2026-05-13T18:15:10.172Z",
"dateReserved": "2025-11-03T20:44:17.691Z",
"dateUpdated": "2026-05-13T18:59:16.461Z",
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