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CVE-2026-89209

High7.6

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.

CVSS
7.6v4.0
EPSS (exploit probability)
0.3%18th pct
CISA KEV
Not listed

EPSS trendFIRST daily scores, last 90 days

FIRST EPSS held steady from 0.3% on 2026-10-27 to 0.3% on 2026-10-29, ranging 0.3%–0.3% across 3 daily scores.
2026-10-27 → 2026-10-29 · 3 days · 0.3%–0.3%
Daily values
FIRST EPSS daily scores for this CVE
Score dateEPSSPercentile
2026-10-290.3%17.7%
2026-10-280.3%17.6%
2026-10-270.3%17.6%

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Learn

Why it happened and what stops it

The weakness (CWE)

Coverage1 article

References

Facts sourced from NVD, FIRST EPSS, and CISA KEV. Last synced 2026-10-30 03:50 UTC.

  • CVSS & description: NVD 2.0, fetched 2026-10-29 15:50 UTC
  • EPSS: FIRST EPSS, fetched 2026-10-30 03:50 UTC; score date 2026-10-29
  • KEV: CISA KEV, fetched 2026-10-30 03:50 UTC