CVE-2026-25815 Weak cryptography in FortiOS
Attackers can decrypt LDAP credentials from FortiOS configuration files due to a shared default encryption key, exposing sensitive authentication data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-25815?
CVE-2026-25815 is a low-severity vulnerability in Fortinet FortiOS, published on 5 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Fortinet FortiOS through 7.6.6 allows attackers to decrypt LDAP credentials stored in device configuration files, as exploited in the wild from 2025-12-16 through 2026 (by default, the encryption key is the same across all customers' installations). NOTE: the Supplier's position is that the instance of CWE-1394 is not a vulnerability because customers "are supposed to enable" a non-default option that eliminates the weakness. However, that non-default option can disrupt functionality as shown in the "Managing FortiGates with private data encryption" document, and is therefore intentionally not a default option.
Weakness: CWE-1394
Which versions are affected by CVE-2026-25815?
How do I fix CVE-2026-25815?
No fix has been published for CVE-2026-25815 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-25815 being exploited?
There is no known exploitation of CVE-2026-25815 in the wild and no public exploit code.
Sources
Also known as GHSA-867w-ffwp-rh44.