Advisory [CVE-2026-97791] In Apache CXF, STSTokenValidator checks whether a SAML assertion is signed by a trusted certificate before deciding to send it to the STS
This security Apache Software Foundation advisory covers CVE-2026-97791; related products: Apache CXF.
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Summary
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.
- Apache CXF 4.2.0 before 4.2.4
- Apache CXF 4.0.0 before 4.1.9
- Apache CXF before 3.6.13
Official advisory · medium-confidence parse· fetched 16 hours ago·verify at source
- 4.2.4
- 4.1.9
- 3.6.13
Official advisory · medium-confidence parse· fetched 16 hours ago·verify at source
Mitigation checklist
- Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.
Official advisory · medium-confidence parse· fetched 16 hours ago·verify at source
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