Incorrect Implementation of Authentication Algorithm in FortiMail - CVE-2026-126151
Published: November 11, 2026
Vulnerability identifier: #VU165165
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-126151
CWE-ID: CWE-303
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.
The vulnerability exists due to incorrect implementation of authentication algorithm in fortiweb2. An unauthenticated remote attacker can gain elevation of privilege (account takeover) via a crafted request.
Affected software
FortiMail
How to mitigate CVE-2026-126151
Install update from vendor's website.
FortiMail - addressed in versions 7.4.9, 7.6.7, 8.0.2