Improper signature verification in Siemens Mendix SAML
Priority MEDIUM 40CWE-347Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-347.
Summary
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 9.24 compatible) (All versions < V3.6.29). Affected versions of the module do not properly validate the SAML response signature. This could allow unauthenticated remote attackers to hijack an account (session) in specific SSO configurations.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00276 20th percentileScored 2026-11-07
Fix Fixed Mendix SAML (Mendix 10 compatible) (Siemens): V4.2.4Mendix SAML (Mendix 11 compatible) (Siemens): V4.2.4+1 more product
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Siemens | Mendix SAML (Mendix 10 compatible) | before V4.2.4 | V4.2.4 | Patch available | CNA |
| Siemens | Mendix SAML (Mendix 11 compatible) | before V4.2.4 | V4.2.4 | Patch available | CNA |
| Siemens | Mendix SAML (Mendix 9.24 compatible) | before V3.6.29 | V3.6.29 | Patch available | CNA |
- Mendix SAML (Mendix 10 compatible) VendorSiemens Affected before V4.2.4 Fixed in V4.2.4 Patch available CNA
- Mendix SAML (Mendix 11 compatible) VendorSiemens Affected before V4.2.4 Fixed in V4.2.4 Patch available CNA
- Mendix SAML (Mendix 9.24 compatible) VendorSiemens Affected before V3.6.29 Fixed in V3.6.29 Patch available CNA
Remediation
- Fix · CNA Mendix SAML (Mendix 10 compatible) (Siemens) Fixed in V4.2.4
- Fix · CNA Mendix SAML (Mendix 11 compatible) (Siemens) Fixed in V4.2.4
- Fix · CNA Mendix SAML (Mendix 9.24 compatible) (Siemens) Fixed in V3.6.29
Timeline
- 2026-10-02 Threatist record created from CVE-2026-80465
- 2026-10-03 Alias added: GHSA-249p-r5w7-w969
- 2026-10-26 Title updated · CNA
- 2026-10-26 Fix available: Siemens/Mendix SAML (Mendix 10 compatible)@V4.2.4, Siemens/Mendix SAML (Mendix 11 compatible)@V4.2.4, Siemens/Mendix SAML (Mendix 9.24 compatible)@V3.6.29 · CNA
References
More Siemens vulnerabilities
- TI-2026-20057 Authentication bypass in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.4
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2025-18911 Heap-based buffer overflow in Fortinet FortiSwitchManager KEVCVSS 3.1CRITICAL 9.8
- TI-2025-09686 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.8
- TI-2022-07142 Code injection in Spring Framework KEVCVSS 3.1CRITICAL 9.8
- TI-2021-19919 Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints KEVCVSS 3.1CRITICAL 10.0
Sources
- CVE-2026-80465 · CVE Program
- CVE-2026-80465 · NVD
- FIRST EPSS
- GHSA-249p-r5w7-w969 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences