High severity · published Sep 3, 2026
CVE-2026-80465
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…
8.7
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MS
Mendix SAML (Mendix 10 compatible) · Siemens
before V4.2.4 · source: vendor
MS
Mendix SAML (Mendix 11 compatible) · Siemens
before V4.2.4 · source: vendor
MS
Mendix SAML (Mendix 9.24 compatible) · Siemens
before V3.6.29 · source: vendor
Affected product
MS
Mendix SAML (Mendix 10 compatible)
Siemens
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-80465
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-80465
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-887643.html
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