Improper signature verification in Siemens Mendix SAML
Priority LOW 39CWE-347Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-347.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0026 17th percentileScored 2026-11-07
Fix Fixed Mendix SAML (Mendix 10.12 compatible) (Siemens): V4.0.3Mendix SAML (Mendix 10.21 compatible) (Siemens): V4.1.2+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 10.12 compatible) | before V4.0.3 | V4.0.3 | Patch available | CNA |
| Siemens | Mendix SAML (Mendix 10.21 compatible) | before V4.1.2 | V4.1.2 | Patch available | CNA |
| Siemens | Mendix SAML (Mendix 9.24 compatible) | before V3.6.21 | V3.6.21 | Patch available | CNA |
- Mendix SAML (Mendix 10.12 compatible) VendorSiemens Affected before V4.0.3 Fixed in V4.0.3 Patch available CNA
- Mendix SAML (Mendix 10.21 compatible) VendorSiemens Affected before V4.1.2 Fixed in V4.1.2 Patch available CNA
- Mendix SAML (Mendix 9.24 compatible) VendorSiemens Affected before V3.6.21 Fixed in V3.6.21 Patch available CNA
Remediation
- Fix · CNA Mendix SAML (Mendix 10.12 compatible) (Siemens) Fixed in V4.0.3
- Fix · CNA Mendix SAML (Mendix 10.21 compatible) (Siemens) Fixed in V4.1.2
- Fix · CNA Mendix SAML (Mendix 9.24 compatible) (Siemens) Fixed in V3.6.21
Timeline
- 2026-10-02 Threatist record created from CVE-2025-40758
- 2026-10-03 Alias added: GHSA-jcx5-8f6x-5fx8
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-2025-40758 · CVE Program
- CVE-2025-40758 · NVD
- FIRST EPSS
- GHSA-jcx5-8f6x-5fx8 · GitHub Advisory Database · CC BY 4.0
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