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CriticalKEV

CVE-2026-24858 — Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability

CVE-2026-24858 · FortiWeb · CVSS 9.8 · KEV

In brief

Severity · CVSS
Critical9.8CVSS 3.1, Critical
EPSS
86%
CISA KEV
Known exploited, listed since 27 Jan 2026
Vendor
Fortinet
Published · Modified
·
Last verified

Summary

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

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

22 branches with a published fixed release

Fortinet FortiWeb

Source: FG-IR-26-060CVE-2026-24858

  1. 8.0
    Affected versions8.0.0 – 8.0.3
    First fixed release8.0.4
  2. 7.6
    Affected versions7.6.0 – 7.6.6
    First fixed release7.6.7
  3. 7.4
    Affected versions7.4.0 – 7.4.11
    First fixed release7.4.12
  4. 7.2Approaching end of support
    Affected versionsNot affected
    First fixed release—
  5. 7.0End of life
    Affected versionsNot affected
    First fixed release—

Releases the vendor does not list are not affected.

Fortinet FortiNAC-F

Source: FG-IR-26-060CVE-2026-24858

  1. 7.6
    Affected versions7.6.3 – 7.6.5
    First fixed release7.6.6
  2. 7.4
    Affected versionsNot affected
    First fixed release—
  3. 7.2
    Affected versionsNot affected
    First fixed release—

Releases the vendor does not list are not affected.

Fortinet FortiOS

Source: FG-IR-26-060CVE-2026-24858

  1. 8.0
    Affected versionsNot affected
    First fixed release—
  2. 7.6
    Affected versions7.6.0 – 7.6.5
    First fixed release7.6.6
  3. 7.4
    Affected versions7.4.0 – 7.4.10
    First fixed release7.4.11
  4. 7.2End of life
    Affected versions7.2.0 – 7.2.12
    First fixed release7.2.13
  5. 7.0End of life
    Affected versions7.0.0 – 7.0.18
    First fixed release7.0.19
  6. 6.4End of life
    Affected versionsNot affected
    First fixed release—

Releases the vendor does not list are not affected.

Fortinet FortiAnalyzer

Source: FG-IR-26-060CVE-2026-24858

  1. 7.6
    Affected versions7.6.0 – 7.6.5
    First fixed release7.6.6
  2. 7.4
    Affected versions7.4.0 – 7.4.9
    First fixed release7.4.10
  3. 7.2End of life
    Affected versions7.2.0 – 7.2.11
    First fixed release7.2.12
  4. 7.0End of life
    Affected versions7.0.0 – 7.0.15
    First fixed release7.0.16
  5. 6.4End of life
    Affected versionsNot affected
    First fixed release—

Releases the vendor does not list are not affected.

Fortinet FortiProxy

Source: FG-IR-26-060CVE-2026-24858

  1. 7.6
    Affected versions7.6.0 – 7.6.4
    First fixed release7.6.5
  2. 7.4
    Affected versions7.4.0 – 7.4.12
    First fixed release7.4.13
  3. 7.2Approaching end of support
    Affected versions7.2.0 – 7.2.15
    First fixed release7.2.16
  4. 7.0End of life
    Affected versions7.0.0 – 7.0.22
    First fixed release7.0.23

Releases the vendor does not list are not affected.

Fortinet FortiManager

Source: FG-IR-26-060CVE-2026-24858

  1. 8.0
    Affected versionsNot affected
    First fixed release—
  2. 7.6
    Affected versions7.6.0 – 7.6.5
    First fixed release7.6.6
  3. 7.4
    Affected versions7.4.0 – 7.4.9
    First fixed release7.4.10
  4. 7.2End of life
    Affected versions7.2.0 – 7.2.11
    First fixed release7.2.12
  5. 7.0End of life
    Affected versions7.0.0 – 7.0.15
    First fixed release7.0.16
  6. 6.4End of life
    Affected versionsNot affected
    First fixed release—

Releases the vendor does not list are not affected.

Fortinet FortiSwitchManager

Source: FG-IR-26-060

  1. 7.2
    Affected versions7.2.0 – 7.2.8
    First fixed release7.2.9
  2. 7.0
    Affected versions7.0.0 – 7.0.7
    First fixed release7.0.8

Remediation

Fix available

Vendor fix

  • FortiWeb 8.08.0.4
  • FortiWeb 7.67.6.7
  • FortiWeb 7.47.4.12
  • FortiNAC-F 7.67.6.6
  • FortiOS 7.67.6.6
  • FortiOS 7.47.4.11
  • FortiOS 7.27.2.13
  • FortiOS 7.07.0.19
  • FortiAnalyzer 7.67.6.6
  • FortiAnalyzer 7.47.4.10
  • FortiAnalyzer 7.27.2.12
  • FortiAnalyzer 7.07.0.16
  • FortiProxy 7.67.6.5
  • FortiProxy 7.47.4.13
  • FortiProxy 7.27.2.16
  • FortiProxy 7.07.0.23
  • FortiManager 7.67.6.6
  • FortiManager 7.47.4.10
  • FortiManager 7.27.2.12
  • FortiManager 7.07.0.16
  • FortiSwitchManager 7.27.2.9
  • FortiSwitchManager 7.07.0.8

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

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

Full text

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…

SourceFortinet (CVE record)

SourceFortiGuard FG-IR-26-060

CISA KEV 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.

CISA due date:

SourceCISA KEV

CERT-FR recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

SourceCERTFR-2026-AVI-0097

Last verified 1 Oct 2026 at 09:31 UTC

Known exploitation

Added to CISA KEV on 27 Jan 2026

Federal remediation due date: 30 Jan 2026

The CISA required action is shown under Remediation.

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

CERT-FR

1 document of the French national CERT (ANSSI) references this CVE.

Advisory (AVI)CERTFR-2026-AVI-0097Published 28 Jan 2026

Vulnerability in Fortinet products

Security policy bypass

Summary

A vulnerability has been discovered in Fortinet products. It allows an attacker to cause a security policy bypass. Fortinet indicates that vulnerability CVE-2026-24858 is actively exploited.

Recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

Official document on cert.ssi.gouv.frread by Patcharo 28 Sept 2026 at 20:04 UTCMachine translation of the French text published by CERT-FR; a text whose translation did not pass Patcharo's checks stays in French. Identifiers, versions and links are copied unchanged.

Timeline

  1. Added to CISA KEV
  2. Published by the source
  3. CISA remediation due date
  4. Source record last modified
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

References

Vendor advisory

Fortinet · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · FortiGuard FG-IR-26-060

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: FortiOS version numbering: branches, patch releases and the Feature and Mature labels

Related vulnerabilities

Other records affecting the same products, newest first.

  • CVE-2026-70468A authentication bypass using an alternate path or channel vulnerability in Fortinet FortiManager 7.6.1, Fort…High
  • CVE-2026-71407A Stack-based Buffer Overflow vulnerability [CWE-121] vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6 m…High
  • CVE-2025-53844A out-of-bounds write vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, For…High
  • CVE-2025-61848An improper neutralization of special elements used in an sql command ('sql injection') vulnerability in Fort…High
  • CVE-2025-53847A missing authentication for critical function vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS…High

All FortiWeb vulnerabilitiesAll FortiOS vulnerabilitiesAll FortiAnalyzer vulnerabilitiesAll FortiProxy vulnerabilitiesAll FortiManager vulnerabilitiesAll Fortinet vulnerabilities