CVE-2026-97791: Apache Software Foundation Apache Cxf

EPSS: 0.2% chance of exploitation in the next 30 days.

In Apache CXF, STSTokenValidator checks whether a SAML assertion is signed by a trusted certificate before deciding to send it to the STS. That result was stored in one object shared by all requests, so one request could read another's result. A remote, unauthenticated attacker could send a forged assertion signed with an untrusted certificate while legitimate requests were being processed, and it could be accepted as trusted without ever reaching the STS. Only services that use STSTokenValidator to validate SAML tokens without alwaysValidateToSts set are affected.  Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.

Affected products

• Apache Software Foundation Apache Cxf: from 4.2.0, before 4.2.4 (fixed in 4.2.4); from 4.0.0, before 4.1.9 (fixed in 4.1.9); before 3.6.13 (fixed in 3.6.13)

Published 2026-10-09. Last modified 2026-10-09.