CVE-2025-40758 Auth bypass in Mendix SAML (Mendix 10.12 compatible)
Insufficient SAML signature validation allows unauthenticated attackers to hijack accounts in specific SSO configurations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-40758?
CVE-2025-40758 is a high-severity authentication bypass vulnerability in Siemens Mendix SAML (Mendix 10.12 compatible), published on 14 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been identified in Mendix SAML (Mendix 10.12 compatible) (All versions < V4.0.3), Mendix SAML (Mendix 10.21 compatible) (All versions < V4.1.2), Mendix SAML (Mendix 9.24 compatible) (All versions < V3.6.21). Affected versions of the module insufficiently enforce signature validation and binding checks. This could allow unauthenticated remote attackers to hijack an account in specific SSO configurations.
Weakness: CWE-347
Which versions are affected by CVE-2025-40758?
How do I fix CVE-2025-40758?
No fix has been published for CVE-2025-40758 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-2025-40758 being exploited?
There is no known exploitation of CVE-2025-40758 in the wild and no public exploit code.
Sources
Also known as GHSA-jcx5-8f6x-5fx8.