Mendix SAML (Mendix 10 compatible): Improper Verification of Cryptographic Signature
CVE-2026-80465 is a high-severity improper verification of cryptographic signature vulnerability in Mendix SAML (Mendix 10 compatible) from Siemens, with a CVSS 3.1 base score of 8.7 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version V4.2.4 as the first without the flaw, so updating Mendix SAML (Mendix 10 compatible) to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.28% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Mendix SAML (Mendix 10 compatible) to V4.2.4 or a later version.
- Update Mendix SAML (Mendix 11 compatible) to V4.2.4 or a later version.
- Update Mendix SAML (Mendix 9.24 compatible) to V3.6.29 or a later version.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Siemens | Mendix SAML (Mendix 10 compatible) | before V4.2.4 | V4.2.4 |
| Siemens | Mendix SAML (Mendix 11 compatible) | before V4.2.4 | V4.2.4 |
| Siemens | Mendix SAML (Mendix 9.24 compatible) | before V3.6.29 | V3.6.29 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- HighSuccess depends on conditions outside the attacker's control.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N. Scored by CNA (siemens.com).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.8 | High | CNA (siemens.com) |
| CVSS 3.1 | 8.7 | High | CNA (siemens.com) |
Official 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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Verification of Cryptographic Signature
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
More Improper Verification of Cryptographic Signature vulnerabilities (CWE-347)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other references
Recent Improper Verification of Cryptographic Signature vulnerabilities
- 9.1 Critical severity
- 7.5 High severity
- 7.9 High severity
- 8.2 High severity
- 8.6 High severity
- 7.6 High severity
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