Siemens Mendix SAML module allows assertion-replay login bypass
Unauthenticated attackers can replay a valid IdP-initiated SAML response; fixes are V4.2.4 and V3.6.29.
46
Vulnerability1 · 1 read
CVE-2026-89209
SAML assertion replay in Mendix SAML IdP-initiated login
- CVSS 4.0
- 7.6 high
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
Mendix SAML modules for Mendix 9, 10, and 11 do not properly block replay of SAML assertions during IdP-initiated authentication. An unauthenticated remote attacker who can replay a valid SAML response may gain unauthorized access to the application. All listed module versions below the fixed releases are affected.
What to do: Upgrade Mendix 10 and 11 SAML modules to V4.2.4 and the Mendix 9 module to V3.6.29.
| Product | Affected | Fixed in |
|---|---|---|
| Siemens Mendix SAML (Mendix 10 compatible) | All versions < V4.2.4 | V4.2.4 |
| Siemens Mendix SAML (Mendix 11 compatible) | All versions < V4.2.4 | V4.2.4 |
| Siemens Mendix SAML (Mendix 9 compatible) | All versions < V3.6.29 | V3.6.29 |
Estimated exposure
No basis for an estimate.
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description · NVD
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
- Vector
- CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X