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CISA KEV · Known exploitedCritical

CVE-2026-24858

Fortinet Multiple Products

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...

CVSS
9.8
EPSS
85.8%
99.7% percentile
CISA KEV
Listed
Published
2026.01.28
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability85.8%
Technical severityCVSS 9.8

Vulnerability overview

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...

Affected product and versions

Product
Fortinet Multiple Products
Affected versions
8.0.0, 7.6.0, 7.4.0, 7.6.3, 7.2.0, 7.0.0, >= 7.0.0 <= 7.0.15, >= 7.2.0 <= 7.2.11, >= 7.4.0 < 7.4.10, >= 7.6.0 < 7.6.6, >= 7.6.3 < 7.6.6, >= 7.0.0 <= 7.0.22, >= 7.2.0 <= 7.2.15, >= 7.4.0 <= 7.4.12, >= 7.6.0 <= 7.6.4, >= 7.4.0 <= 7.4.11, >= 7.6.0 <= 7.6.6, >= 8.0.0 <= 8.0.3, >= 7.0.0 <= 7.0.18
Fixed versions
7.4.10, 7.6.6, 7.4.11

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA 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.

Due date: 2026.01.30
  1. 1
    Identify

    Confirm that Fortinet Multiple Products and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-288
KEV added
2026.01.27
Ransomware use
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