CVE-2026-126255 Auth bypass in FortiOS
Unauthenticated attackers can bypass authentication on FortiOS and FortiPAM using crafted credentials with path traversal.
- 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-2026-126255?
CVE-2026-126255 is a high-severity authentication bypass vulnerability in Fortinet FortiOS, 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 path traversal: '../filedir' vulnerability in Fortinet FortiOS 8.0.0 through 8.0.1, FortiOS 7.6.0 through 7.6.7, FortiOS 7.4.0 through 7.4.12, FortiOS 7.2.0 through 7.2.13, FortiPAM 1.6 all versions, FortiPAM 1.5 all versions, FortiPAM 1.4 all versions, FortiPAM 1.3 all versions, FortiPAM 1.2 all versions, FortiPAM 1.1 all versions, FortiPAM 1.0 all versions may allow an unauthenticated attacker to bypass authentication via specially crafted credentials.
Weakness: CWE-24
Which versions are affected by CVE-2026-126255?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-126255?
No fix has been published for CVE-2026-126255 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-2026-126255 being exploited?
There is no known exploitation of CVE-2026-126255 in the wild and no public exploit code.
Sources
Also known as GHSA-6xmr-2mg3-g5xq.