Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
- Severity
- Critical9.8CVSS 3.1, Critical
- Known exploited
- Known exploitedFederal remediation due date: 30 Jan 2026
- Exploit prediction
- 86%
- Published
- 27 Jan 2026Updated 17 Jun 2026 · Last verified 30 Sept 2026
Known remediation
Fixed releases per branch, as the vendor states them. Patcharo never infers a fix.
Fortinet FortiWeb
Vendor advisory- 8.0Fixed after 8.0.3
- 7.6Fixed after 7.6.6
- 7.4Fixed after 7.4.11
Fortinet FortiOS
Vendor advisory- 7.6Fixed after 7.6.5
- 7.4Fixed after 7.4.10
- 7.2Fixed after 7.2.12
- 7.0Fixed after 7.0.18
Fortinet FortiAnalyzer
Vendor advisory- 7.6Fixed after 7.6.5
- 7.4Fixed after 7.4.9
- 7.2Fixed after 7.2.11
- 7.0Fixed after 7.0.15
Fortinet FortiProxy
Vendor advisory- 7.6Fixed after 7.6.4
- 7.4Fixed after 7.4.12
- 7.2Fixed after 7.2.15
- 7.0Fixed after 7.0.22
Fortinet FortiManager
Vendor advisory- 7.6Fixed after 7.6.5
- 7.4Fixed after 7.4.9
- 7.2Fixed after 7.2.11
- 7.0Fixed after 7.0.15
Workaround / Vendor remediation
Vendor remediation · FortiWeb
Upgrade to upcoming FortiOS version 8.0.0 or above Upgrade to FortiOS version 7.6.6 or above Upgrade to FortiOS version 7.4.11 or above Upgrade to FortiOS version 7.2.13 or above Upgrade to FortiOS version 7.0.19 or above Upgrade to upcoming FortiManager version 8.0.0 or above Upgrade to FortiManager version 7.6.6 or above Upgrade to FortiManager version 7.4.10 or above Upgrade to FortiManager version 7.2.12 or above Upgrade to FortiManager version 7.0.16 or above Upgrade to FortiAnalyzer version 7.6.6 or above Upgrade to FortiAnalyzer version 7.4.10 or above Upgrade to FortiAnalyzer version 7.2.12 or above Upgrade to FortiAnalyzer version 7.0.16 or above Upgrade to FortiProxy version 7.6.5 or above Upgrade to FortiProxy version 7.4.13 or above Upgrade to FortiProxy version 7.2.16 or above Upgrade to FortiProxy version 7.0.23 or above Upgrade to FortiWeb version 8.0.4 or above Upgrade t…
Vendor remediation · FortiOS
Upgrade to upcoming FortiOS version 8.0.0 or above Upgrade to FortiOS version 7.6.6 or above Upgrade to FortiOS version 7.4.11 or above Upgrade to FortiOS version 7.2.13 or above Upgrade to FortiOS version 7.0.19 or above Upgrade to upcoming FortiManager version 8.0.0 or above Upgrade to FortiManager version 7.6.6 or above Upgrade to FortiManager version 7.4.10 or above Upgrade to FortiManager version 7.2.12 or above Upgrade to FortiManager version 7.0.16 or above Upgrade to FortiAnalyzer version 7.6.6 or above Upgrade to FortiAnalyzer version 7.4.10 or above Upgrade to FortiAnalyzer version 7.2.12 or above Upgrade to FortiAnalyzer version 7.0.16 or above Upgrade to FortiProxy version 7.6.5 or above Upgrade to FortiProxy version 7.4.13 or above Upgrade to FortiProxy version 7.2.16 or above Upgrade to FortiProxy version 7.0.23 or above Upgrade to FortiWeb version 8.0.4 or above Upgrade t…
Vendor remediation · FortiAnalyzer
Upgrade to upcoming FortiOS version 8.0.0 or above Upgrade to FortiOS version 7.6.6 or above Upgrade to FortiOS version 7.4.11 or above Upgrade to FortiOS version 7.2.13 or above Upgrade to FortiOS version 7.0.19 or above Upgrade to upcoming FortiManager version 8.0.0 or above Upgrade to FortiManager version 7.6.6 or above Upgrade to FortiManager version 7.4.10 or above Upgrade to FortiManager version 7.2.12 or above Upgrade to FortiManager version 7.0.16 or above Upgrade to FortiAnalyzer version 7.6.6 or above Upgrade to FortiAnalyzer version 7.4.10 or above Upgrade to FortiAnalyzer version 7.2.12 or above Upgrade to FortiAnalyzer version 7.0.16 or above Upgrade to FortiProxy version 7.6.5 or above Upgrade to FortiProxy version 7.4.13 or above Upgrade to FortiProxy version 7.2.16 or above Upgrade to FortiProxy version 7.0.23 or above Upgrade to FortiWeb version 8.0.4 or above Upgrade t…
Vendor remediation · FortiProxy
Upgrade to upcoming FortiOS version 8.0.0 or above Upgrade to FortiOS version 7.6.6 or above Upgrade to FortiOS version 7.4.11 or above Upgrade to FortiOS version 7.2.13 or above Upgrade to FortiOS version 7.0.19 or above Upgrade to upcoming FortiManager version 8.0.0 or above Upgrade to FortiManager version 7.6.6 or above Upgrade to FortiManager version 7.4.10 or above Upgrade to FortiManager version 7.2.12 or above Upgrade to FortiManager version 7.0.16 or above Upgrade to FortiAnalyzer version 7.6.6 or above Upgrade to FortiAnalyzer version 7.4.10 or above Upgrade to FortiAnalyzer version 7.2.12 or above Upgrade to FortiAnalyzer version 7.0.16 or above Upgrade to FortiProxy version 7.6.5 or above Upgrade to FortiProxy version 7.4.13 or above Upgrade to FortiProxy version 7.2.16 or above Upgrade to FortiProxy version 7.0.23 or above Upgrade to FortiWeb version 8.0.4 or above Upgrade t…
Vendor remediation · FortiManager
Upgrade to upcoming FortiOS version 8.0.0 or above Upgrade to FortiOS version 7.6.6 or above Upgrade to FortiOS version 7.4.11 or above Upgrade to FortiOS version 7.2.13 or above Upgrade to FortiOS version 7.0.19 or above Upgrade to upcoming FortiManager version 8.0.0 or above Upgrade to FortiManager version 7.6.6 or above Upgrade to FortiManager version 7.4.10 or above Upgrade to FortiManager version 7.2.12 or above Upgrade to FortiManager version 7.0.16 or above Upgrade to FortiAnalyzer version 7.6.6 or above Upgrade to FortiAnalyzer version 7.4.10 or above Upgrade to FortiAnalyzer version 7.2.12 or above Upgrade to FortiAnalyzer version 7.0.16 or above Upgrade to FortiProxy version 7.6.5 or above Upgrade to FortiProxy version 7.4.13 or above Upgrade to FortiProxy version 7.2.16 or above Upgrade to FortiProxy version 7.0.23 or above Upgrade to FortiWeb version 8.0.4 or above Upgrade t…
Description
Title, description and vendor guidance are quoted from the source records.
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.
Weakness: CWE-288
Known exploited
Added to CISA KEV on 27 Jan 2026
Federal remediation due date: 30 Jan 2026
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.
Exploit prediction
86% probability of exploitation in the next 30 days (percentile 100%).
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What the source states, per branch
Versions matched by Patcharo
Fortinet FortiWebSource: Fortinet (CVE record)
| Branch | Affected | Fixed in |
|---|---|---|
| 8.0 | 8.0.0 – 8.0.3 | Fixed after 8.0.3 |
| 7.6 | 7.6.0 – 7.6.6 | Fixed after 7.6.6 |
| 7.4 | 7.4.0 – 7.4.11 | Fixed after 7.4.11 |
Versions not listed are stated unaffected by the vendor.
Fortinet FortiOSSource: Fortinet (CVE record)
| Branch | Affected | Fixed in |
|---|---|---|
| 7.6 | 7.6.0 – 7.6.5 | Fixed after 7.6.5 |
| 7.4 | 7.4.0 – 7.4.10 | Fixed after 7.4.10 |
| 7.2 | 7.2.0 – 7.2.12 | Fixed after 7.2.12 |
| 7.0 | 7.0.0 – 7.0.18 | Fixed after 7.0.18 |
Versions not listed are stated unaffected by the vendor.
Fortinet FortiAnalyzerSource: Fortinet (CVE record)
| Branch | Affected | Fixed in |
|---|---|---|
| 7.6 | 7.6.0 – 7.6.5 | Fixed after 7.6.5 |
| 7.4 | 7.4.0 – 7.4.9 | Fixed after 7.4.9 |
| 7.2 | 7.2.0 – 7.2.11 | Fixed after 7.2.11 |
| 7.0 | 7.0.0 – 7.0.15 | Fixed after 7.0.15 |
Versions not listed are stated unaffected by the vendor.
Fortinet FortiProxySource: Fortinet (CVE record)
| Branch | Affected | Fixed in |
|---|---|---|
| 7.6 | 7.6.0 – 7.6.4 | Fixed after 7.6.4 |
| 7.4 | 7.4.0 – 7.4.12 | Fixed after 7.4.12 |
| 7.2 | 7.2.0 – 7.2.15 | Fixed after 7.2.15 |
| 7.0 | 7.0.0 – 7.0.22 | Fixed after 7.0.22 |
Versions not listed are stated unaffected by the vendor.
Fortinet FortiManagerSource: Fortinet (CVE record)
| Branch | Affected | Fixed in |
|---|---|---|
| 7.6 | 7.6.0 – 7.6.5 | Fixed after 7.6.5 |
| 7.4 | 7.4.0 – 7.4.9 | Fixed after 7.4.9 |
| 7.2 | 7.2.0 – 7.2.11 | Fixed after 7.2.11 |
| 7.0 | 7.0.0 – 7.0.15 | Fixed after 7.0.15 |
Versions not listed are stated unaffected by the vendor.
Affected products
- Fortinet FortiNAC-F · 7.6.3 ≤ 7.6.5
References
- https://fortiguard.fortinet.com/psirt/FG-IR-26-060(opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-975644.html(opens in a new tab)
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24858(opens in a new tab)
- https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios(opens in a new tab)
Provenance
Every fact on this page comes from the sources below. Nothing is written by an AI.
- Fortinet (CVE record)
- Fortinet (CVE record) · 30 Sept 2026 at 00:17 UTC · Parser patcharo-cve5/1.1.0
- CISA Known Exploited Vulnerabilities
- CISA Known Exploited Vulnerabilities · 30 Sept 2026 at 00:17 UTC · Parser patcharo-kev/1.0.0
- NVD
- NVD · 28 Sept 2026 at 07:02 UTC · Parser patcharo-nvd/1.0.0
- FIRST EPSS
- FIRST EPSS · 27 Sept 2026 at 23:46 UTC · Parser patcharo-epss/1.0.0
Last verified: 30 Sept 2026 at 00:17 UTC