CVE-2026-126157 Auth bypass in FortiMail
Unauthenticated attackers can access other users' secure email accounts in FortiMail via crafted HTTP requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Harmful if only installed
- No
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-126157?
CVE-2026-126157 is a critical authentication bypass vulnerability in Fortinet FortiMail, published on 11 Nov 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A improper authentication vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.8, FortiMail 7.2 all versions may allow an unauthenticated attacker to gain access to other users' secure email accounts via crafted HTTP requests.
Weakness: CWE-287
Which versions are affected by CVE-2026-126157?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-126157?
No fix has been published for CVE-2026-126157 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-126157 being exploited?
There is no known exploitation of CVE-2026-126157 in the wild and no public exploit code.
Sources
Also known as GHSA-7g83-wgvw-67qx.