CVE-2026-80465
SAML signature validation bypass in Mendix SAML modules enabling account/session hijack.
Is CVE-2026-80465 being exploited?
Not confirmed. CVE-2026-80465 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.18% probability of exploitation in the next 30 days.
How severe is CVE-2026-80465?
CVE-2026-80465 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-80465?
Yes. A fix has been recorded for CVE-2026-80465. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-80465 affect?
CVE-2026-80465 affects Mendix SAML (Mendix 10 compatible) all versions < 4.2.3, Mendix SAML (Mendix 11 compatible) all versions < 4.2.3, Mendix SAML (Mendix 9.24 compatible) all versions < 3.6.27. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-80465?
Upgrade Mendix SAML to v4.2.3 (10/11) or v3.6.27 (9.24) immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attackers can forge SAML responses to bypass SSO, hijack user sessions and gain unauthorized account access remotely.
Immediate action required
- affected< V4.2.3
- affected< V4.2.3
- affected< V3.6.27
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.