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Advisory record · GHSA-9mrv-8pvf-hf4m

Apache CXF OAuth2 Missing JWT Audience and Issuer Validation in Access Token Validator

CVSS 9.1 CriticalCriticalEPSS 0.045 · 91st percentile

Critical, because:

  • CVSS score 9.1: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 12 Jun 2026, 12:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.apache.cxf:cxf-rt-rs-security-oauth2Maven>=4.2.0, <4.2.2 || <4.1.74.2.2, 4.1.7
Identifiers
GHSA-9mrv-8pvf-hf4m · CVE-2026-50627
Weakness (CWE)
CWE-289 · CWE-303
Tags
Published
12 Jun 2026
Updated
20 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Apache CXF's cxf-rt-rs-security-oauth2 package, versions from 4.2.0 before 4.2.2 and before 4.1.7, does not validate the audience claim of incoming JWT access tokens in its JwtAccessTokenValidator class. An attacker holding a token issued for one resource server can replay it against a different resource server and have it accepted. The source gives few details on the exact attacker position required. Upgrade to version 4.2.2 or 4.1.7.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.1 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.045, the 91st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 12 Jun 2026, 10:16 UTC Confirmed by NVD
  2. 31 Oct 2026, 14:19 UTC First seen by agentprime
  3. 31 Oct 2026, 14:19 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.