CVE-2026-89209

What it is

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 compatible) (All versions < V3.6.29). Affected versions of the module do not properly protect against SAML assertion replay in IdP-initiated authentication flows. This could allow unauthenticated remote attackers to gain unauthorized access to the application by replaying a valid SAML response.

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. High risk of data exposure, data tampering.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2026-09-11 07:45 UTC ReservedThe CVE id was reserved by its CNA
2. 2026-10-26 11:16 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-10-31 02:17 UTC Last updatedMost recent change to the record

Details

Published

2026-10-26 11:16 UTC

Last modified

2026-10-31 02:17 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-294

Record status

Deferred

Attack profile CVSS 4.0 · 7.6

Attack vector

Network

Complexity

High

Attack requirements

None

Privileges needed

None

User interaction

Passive

Confidentiality

High

Integrity

High

Availability

None