Missing authentication for critical function in FortiMail - CVE-2026-126157
Published: November 11, 2026
Vulnerability identifier: #VU165167
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-126157
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
The vulnerability exists due to missing authentication for critical function. An unauthenticated attacker can gain access to other users' secure email accounts via crafted HTTP requests.
Affected software
FortiMail
How to mitigate CVE-2026-126157
Install update from vendor's website.
FortiMail - addressed in versions 7.4.9, 7.6.7, 8.0.2