CVE-2026-24858
📛 CVE Title
CVE-2026-24858
Description
An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] vulnerability in Fortinet FortiAnalyzer 7.6.0 through 7.6.5, FortiAnalyzer 7.4.0 through 7.4.9, FortiAnalyzer 7.2.0 through 7.2.11, FortiAnalyzer 7.0.0 through 7.0.15, FortiManager 7.6.0 through 7.6.5, FortiManager 7.4.0 through 7.4.9, FortiManager 7.2.0 through 7.2.11, FortiManager 7.0.0 through 7.0.15, FortiOS 7.6.0 through 7.6.5, FortiOS 7.4.0 through 7.4.10, FortiOS 7.2.0 through 7.2.12, FortiOS 7.0.0 through 7.0.18, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4.0 through 7.4.12, FortiProxy 7.2.0 through 7.2.15, FortiProxy 7.0.0 through 7.0.22, FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11 may allow an attacker with a FortiCloud account and a registered device to log into other devices registered to other accounts, if FortiCloud SSO authentication is enabled on those devices.
Description (MITRE) cveawg.mitre.org
Pulled from cveawg.mitre.org/api/cve/CVE-2026-24858 on 2026-06-30. Shown when MITRE's text differs from the cvelistV5 mirror.
An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] vulnerability in Fortinet FortiAnalyzer 7.6.0 through 7.6.5, FortiAnalyzer 7.4.0 through 7.4.9, FortiAnalyzer 7.2.0 through 7.2.11, FortiAnalyzer 7.0.0 through 7.0.15, FortiManager 7.6.0 through 7.6.5, FortiManager 7.4.0 through 7.4.9, FortiManager 7.2.0 through 7.2.11, FortiManager 7.0.0 through 7.0.15, FortiNAC-F 7.6.3 through 7.6.5, FortiOS 7.6.0 through 7.6.5, FortiOS 7.4.0 through 7.4.10, FortiOS 7.2.0 through 7.2.12, FortiOS 7.0.0 through 7.0.18, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4.0 through 7.4.12, FortiProxy 7.2.0 through 7.2.15, FortiProxy 7.0.0 through 7.0.22, FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11 may allow an attacker with a FortiCloud account and a registered device to log into other devices registered to other accounts, if FortiCloud SSO authentication is enabled on those devices.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- fortinet
- CVSS severity
- CRITICAL
- CVSS score
- 9.4 / 10
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C- Effective score
- 9.4 / 10 CRITICAL source: CNA overview
- CWE(s)
-
CWE-288 - Reserved
- 2026-01-27
- Published
- 2026-01-27 19:18 UTC
- Last updated
- 2026-05-12 12:08 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/24xxx/CVE-2026-24858.json
- Linked Threat
- CVE-2026-24858 — Fortinet Multiple Products: Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
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
- Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
- Vendor / project
- Fortinet
- Product
- Multiple Products
- Date added to KEV
- 2026-01-27
- Remediation due
- 2026-01-30
- 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.
- Ransomware campaign use
- Unknown
- CISA notes
- Please adhere to Fortinet's guidelines to assess exposure and mitigate risks. Check for signs of potential compromise on all internet accessible Fortinet products affected by this vulnerability. Apply any final mitigations provided by the vendor as soon as they become available. For more information please see: https://fortiguard.fortinet.com/psirt/FG-IR-26-060 ; https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios ; https://nvd.nist.gov/vuln/detail/CVE-2026-24858
- 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
- 2026-01-27 20:16:24 UTC
- NVD last modified
- 2026-05-12 18:47:28 UTC
- NVD CVSS v3.1
- 9.8 / 10 CRITICAL source: psirt@fortinet.com
- 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
- 0.0395 (probability of exploitation in next 30 days)
- EPSS percentile
- 88.49% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD / KEV / EPSS data refreshed 2026-05-25 03:37 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-2026-4712 - Assigner
- fortinet
- Published
- Jan 27, 2026, 7:18:23 PM
- Updated
- May 12, 2026, 12:08:56 PM
- EUVD base score (CVSS 3.1)
-
9.4 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C - EUVD-reported EPSS
- 3.9500
- Vendors
- Fortinet
- Products
-
FortiOS (7.6.0 ≤7.6.5)FortiAnalyzer (7.6.0 ≤7.6.5)FortiProxy (7.6.0 ≤7.6.4)FortiWeb (7.6.0 ≤7.6.6)FortiWeb (8.0.0 ≤8.0.3)FortiOS (7.0.0 ≤7.0.18)FortiManager (7.2.0 ≤7.2.11)FortiWeb (7.4.0 ≤7.4.11)FortiManager (7.0.0 ≤7.0.15)FortiOS (7.2.0 ≤7.2.12)FortiProxy (7.4.0 ≤7.4.12)FortiProxy (7.0.0 ≤7.0.22)FortiManager (7.6.0 ≤7.6.5)FortiAnalyzer (7.4.0 ≤7.4.9)FortiManager (7.4.0 ≤7.4.9)FortiOS (7.4.0 ≤7.4.10)FortiAnalyzer (7.2.0 ≤7.2.11)FortiAnalyzer (7.0.0 ≤7.0.15)FortiProxy (7.2.0 ≤7.2.15)
- Aliases
-
GHSA-2x38-48vp-w23x
ENISA description: An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] vulnerability in Fortinet FortiAnalyzer 7.6.0 through 7.6.5, FortiAnalyzer 7.4.0 through 7.4.9, FortiAnalyzer 7.2.0 through 7.2.11, FortiAnalyzer 7.0.0 through 7.0.15, FortiManager 7.6.0 through 7.6.5, FortiManager 7.4.0 through 7.4.9, FortiManager 7.2.0 through 7.2.11, FortiManager 7.0.0 through 7.0.15, FortiOS 7.6.0 through 7.6.5, FortiOS 7.4.0 through 7.4.10, FortiOS 7.2.0 through 7.2.12, FortiOS 7.0.0 through 7.0.18, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4.0 through 7.4.12, FortiProxy 7.2.0 through 7.2.15, FortiProxy 7.0.0 through 7.0.22, FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11 may allow an attacker with a FortiCloud account and a registered device to log into other devices registered to other accounts, if FortiCloud SSO authentication is enabled on those devices.
EUVD references (1)
Affected products (5)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Fortinet | FortiOS |
7.6.0 (affected),
7.4.0 (affected),
7.2.0 (affected),
7.0.0 (affected)
|
— |
| Fortinet | FortiManager |
7.6.0 (affected),
7.4.0 (affected),
7.2.0 (affected),
7.0.0 (affected)
|
— |
| Fortinet | FortiAnalyzer |
7.6.0 (affected),
7.4.0 (affected),
7.2.0 (affected),
7.0.0 (affected)
|
— |
| Fortinet | FortiProxy |
7.6.0 (affected),
7.4.0 (affected),
7.2.0 (affected),
7.0.0 (affected)
|
— |
| Fortinet | FortiWeb |
8.0.0 (affected),
7.6.0 (affected),
7.4.0 (affected)
|
— |
Affected products — CPE 2.3 (7) 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:a:fortinet:fortianalyzer:*:*:*:*:*:*:*:*cpe:2.3:a:fortinet:fortimanager:*:*:*:*:*:*:*:*cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:*cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*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.
Web references (10)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-24858 rapid7:services.nvd.nist.gov
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-24858 rapid7:cve.mitre.org
- https://www.fortiguard.com/psirt/FG-IR-26-060 rapid7:www.fortiguard.com
- https://fortiguard.fortinet.com/psirt/FG-IR-26-060 rapid7:fortiguard.fortinet.com
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24858 rapid7:www.cisa.gov
- https://www.cve.org/CVERecord?id=CVE-2026-24858 rapid7:www.cve.org
- http://cwe.mitre.org/data/definitions/288.html rapid7:cwe.mitre.org
- https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios rapid7:www.fortinet.com
- https://attackerkb.com/topics/CVE-2026-24858 rapid7:attackerkb.com
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-4712 rapid7:euvd.enisa.europa.eu
NVD-tagged references (4)
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-975644.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e Third Party Advisory
- https://fortiguard.fortinet.com/psirt/FG-IR-26-060 psirt@fortinet.com Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24858 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource
- https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios 134c704f-9b21-4f2e-91b3-4a467353bcc0 MitigationVendor Advisory
Indicators (2)
IOCs linked to the auto-promoted Threat row.
| Type | Value | VirusTotal | Attached |
|---|---|---|---|
| cwe |
CWE-288
|
no local data | 2026-05-14 02:58 UTC |
| cve |
CVE-2026-24858
|
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.upguard.com
CVE-2026-24858 is a critical (CVSS 9.8) Fortinet authentication bypass vulnerability in FortiOS, FortiManager, and more, currently under active exploitation.
2026-05-14 17:50 UTC -
web:thehackernews.com
Fortinet released updates for an actively exploited FortiOS SSO authentication bypass flaw, CVE-2026-24858 , now listed by CISA in KEV.
2026-05-14 17:50 UTC -
web:app.opencve.io
An Authentication Bypass Using an Alternate Path or Channel vulnerability (CWE-288) exists in multiple Fortinet products. The flaw allows an attacker who holds a valid FortiCloud account and has a registered device to authenticate to other devices registered under different accounts when FortiCloud SSO is enabled, effectively bypassing normal authentication controls and granting full ...
2026-05-14 17:50 UTC -
web:www.cisa.gov
According to Fortinet, on Jan. 26, 2026 , Fortinet disabled all FortiCloud SSO authentication to mitigate CVE-2026-24858 , then reinstated the service on Jan. 27, 2026 , with changes to prevent exploitation of vulnerable devices. CISA added CVE-2026-24858 to its Known Exploited Vulnerabilities (KEV) Catalog on Jan. 27, 2026 .
2026-05-14 17:50 UTC -
web:www.cve.org
Vulnerability detail for CVE-2026-24858 Notice: Expanded keyword searching of CVE Records (with limitations) is now available in the search box above. Learn more here.
2026-05-14 17:50 UTC -
web:www.gopher.security
Fortinet's FortiOS, FortiManager, and FortiAnalyzer have a critical SSO authentication bypass vulnerability ( CVE-2026-24858 ) actively exploited. Patch now!
2026-05-14 17:50 UTC -
web:www.sentinelone.com
CVE-2026-24858 is an authentication bypass vulnerability in Fortinet FortiAnalyzer. Learn about its impact, affected versions, and mitigation methods.
2026-05-14 17:50 UTC -
web:www.tenable.com
An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] vulnerability in Fortinet FortiAnalyzer 7.6.0 through 7.6.5, FortiAnalyzer 7.4.0 ...
2026-05-14 17:50 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: 2026-01-30 Known ransomware campaign use: Unknown
2026-05-14 01:13 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-24858.json.
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{
"tags": [
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"url": "https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios"
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"title": "CISA ADP Vulnrichment"
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{
"affected": [
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"versions": [
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"providerMetadata": {
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"cna": {
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{
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],
"descriptions": [
{
"lang": "en",
"value": "An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] vulnerability in Fortinet FortiAnalyzer 7.6.0 through 7.6.5, FortiAnalyzer 7.4.0 through 7.4.9, FortiAnalyzer 7.2.0 through 7.2.11, FortiAnalyzer 7.0.0 through 7.0.15, FortiManager 7.6.0 through 7.6.5, FortiManager 7.4.0 through 7.4.9, FortiManager 7.2.0 through 7.2.11, FortiManager 7.0.0 through 7.0.15, FortiOS 7.6.0 through 7.6.5, FortiOS 7.4.0 through 7.4.10, FortiOS 7.2.0 through 7.2.12, FortiOS 7.0.0 through 7.0.18, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4.0 through 7.4.12, FortiProxy 7.2.0 through 7.2.15, FortiProxy 7.0.0 through 7.0.22, FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11 may allow an attacker with a FortiCloud account and a registered device to log into other devices registered to other accounts, if FortiCloud SSO authentication is enabled on those devices."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.4,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-288",
"description": "Improper access control",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-23T17:23:13.215Z",
"orgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8",
"shortName": "fortinet"
},
"references": [
{
"name": "https://fortiguard.fortinet.com/psirt/FG-IR-26-060",
"url": "https://fortiguard.fortinet.com/psirt/FG-IR-26-060"
}
],
"solutions": [
{
"lang": "en",
"value": "Upgrade to upcoming FortiOS version 8.0.0 or above\nUpgrade to FortiOS version 7.6.6 or above\nUpgrade to FortiOS version 7.4.11 or above\nUpgrade to FortiOS version 7.2.13 or above\nUpgrade to FortiOS version 7.0.19 or above\nUpgrade to upcoming FortiManager version 8.0.0 or above\nUpgrade to FortiManager version 7.6.6 or above\nUpgrade to FortiManager version 7.4.10 or above\nUpgrade to FortiManager version 7.2.12 or above\nUpgrade to FortiManager version 7.0.16 or above\nUpgrade to FortiAnalyzer version 7.6.6 or above\nUpgrade to FortiAnalyzer version 7.4.10 or above\nUpgrade to FortiAnalyzer version 7.2.12 or above\nUpgrade to FortiAnalyzer version 7.0.16 or above\nUpgrade to FortiProxy version 7.6.5 or above\nUpgrade to FortiProxy version 7.4.13 or above\nUpgrade to FortiProxy version 7.2.16 or above\nUpgrade to FortiProxy version 7.0.23 or above\nUpgrade to FortiWeb version 8.0.4 or above\nUpgrade to FortiWeb version 7.6.7 or above\nUpgrade to FortiWeb version 7.4.12 or above\nUpgrade to FortiNAC-F version 7.6.6 or above\nUpgrade to FortiSwitchManager version 7.2.9 or above\nUpgrade to FortiSwitchManager version 7.0.8 or above"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8",
"assignerShortName": "fortinet",
"cveId": "CVE-2026-24858",
"datePublished": "2026-01-27T19:18:23.591Z",
"dateReserved": "2026-01-27T15:11:02.057Z",
"dateUpdated": "2026-05-12T12:08:56.335Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}