---
id: CVE-2026-80465
title: >-
  A vulnerability has been identified in Mendix SAML (Mendix 10 compatible) (All
  versions < V4.2.3), Mendix SAML (Mendix 11 compatible) (All versions <
  V4.2.3), Mendix SAML (Mendix 9.24 compatible) (All versions < V3.6.27)
summary: >-
  A vulnerability has been identified in Mendix SAML (Mendix 10 compatible) (All
  versions < V4.2.3), Mendix SAML (Mendix 11 compatible) (All versions <
  V4.2.3), Mendix SAML (Mendix 9.24 compatible) (All versions < V3.6.27).
  Affected versio…
severity: high
cvss: 8.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N'
cwe:
  - CWE-347
published: '2026-09-03'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T18:41:55.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80465'
references:
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-887643.html'
    label: productcert@siemens.com
tags:
  - nvd
epss: 0.00176
epssPercentile: 0.07338
ingestedAt: '2026-09-08T19:08:49.591Z'
---

## Overview

A vulnerability has been identified in Mendix SAML (Mendix 10 compatible) (All versions < V4.2.3), Mendix SAML (Mendix 11 compatible) (All versions < V4.2.3), Mendix SAML (Mendix 9.24 compatible) (All versions < V3.6.27). 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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.