CVE-2026-97468: Apache CXF hash collision bypass in STS token validation

CVE-2026-97468 · Severity: critical · CVSS 9.1 · Published 2026-10-09

Apache CXF is a web services framework that handles authentication and token validation for enterprise systems. The framework cached validated security tokens using a weak hash function, allowing attackers to craft fraudulent tokens with matching hashes to bypass authentication and impersonate other users without password validation. An attacker could obtain forged STS-signed tokens under a victim's identity, enabling account takeover and unauthorized access to protected services.

Technologies: Apache CXF. Vendors: Apache.

Quick answers

Is CVE-2026-97468 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-97468 being exploited in the wild.
How severe is CVE-2026-97468?
Critical severity, with a CVSS score of 9.1, published 9 October 2026.
Which products and versions are affected?
Apache CXF versions prior to 4.2.4, 4.1.9, or 3.6.13.
Is there a fix for CVE-2026-97468?
Yes: fixed in Apache CXF 4.2.4, 4.1.9, 3.6.13. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-97468 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-97468?
Check whether you run Apache CXF at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: Apache CXF 4.2.4, 4.1.9, 3.6.13

Technical details

The STSTokenValidator and Security Token Service (STS) components use Java's non-cryptographic Arrays.hashCode() to cache validated security tokens, then treat cache hits as proof of prior validation. An attacker can craft a UsernameToken or SAML Assertion with a hash collision against a cached entry, bypassing password validation, signature trust verification, and STS validation calls. The weak 32-bit hash function makes collision attacks feasible, allowing authentication as arbitrary users.

Affected products

  • Apache CXF versions prior to 4.2.4, 4.1.9, or 3.6.13

Timeline

  • 2026-10-09: disclosed

References

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