CVE-2026-89209 A vulnerability has been identified in Mendix SAML (Mendix 10 compatible) (All versions < V4.2.4), Mendix SAML (Mendix 11 compatible) (All v
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-89209?
CVE-2026-89209 is a high-severity vulnerability in Siemens Mendix SAML (Mendix 10 compatible), published on 26 Oct 2026.
Official description
A vulnerability has been identified in Mendix SAML (Mendix 10 compatible) (All versions < V4.2.4), Mendix SAML (Mendix 11 compatible) (All versions < V4.2.4), Mendix SAML (Mendix 9 compatible) (All versions < V3.6.29). Affected versions of the module do not properly protect against SAML assertion replay in IdP-initiated authentication flows. This could allow unauthenticated remote attackers to gain unauthorized access to the application by replaying a valid SAML response.
Weakness: CWE-294
Which versions are affected by CVE-2026-89209?
How do I fix CVE-2026-89209?
No fix has been published for CVE-2026-89209 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-89209 being exploited?
There is no known exploitation of CVE-2026-89209 in the wild and no public exploit code.
Sources
Also known as GHSA-c6gm-hvjc-mr8p.