---
title: "CVE-2026-50627: Apache CXF OAuth2 Missing JWT Audience and Issuer Validation in Access Token Validator"
url: https://erroneo.us/security/cve/CVE-2026-50627/
description: "CVE-2026-50627 (org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven)): The JwtAccessTokenValidator class in Apache CXF fails to validate the 'aud' (Audience)…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-12
date_modified: 2026-08-20
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-50627"
kev: false
cvss: 8.1
epss: 0.00776
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-50627: Apache CXF OAuth2 Missing JWT Audience and Issuer Validation in Access Token Validator

**Signal:** Normal patch cycle. No exploitation signal; fix it in your next routine update if you are affected. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.8% , percentile 55: FIRST’s model estimates a 0.8% chance of exploitation activity in the next 30 days, higher than 55% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven) >= 4.2.0, < 4.2.2, fixed in 4.2.2 ; org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven) < 4.1.7, fixed in 4.1.7 . Check your lockfile, including transitive dependencies.

## What it is

The JwtAccessTokenValidator class in Apache CXF fails to validate the 'aud' (Audience) claims of incoming JWT access tokens. This allows a JWT issued for one Resource Server to be successfully replayed against a completely different Resource Server, leading to Token Confusion/Routing attacks. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.

## Affected packages

- Maven `org.apache.cxf:cxf-rt-rs-security-oauth2` >= 4.2.0, < 4.2.2 → fixed: 4.2.2
- Maven `org.apache.cxf:cxf-rt-rs-security-oauth2` < 4.1.7 → fixed: 4.1.7

## Affected products (CVE record)

- Apache Software Foundation Apache CXF: 4.2.0 < 4.2.2, 4.0.0 < 4.1.7, < 3.6.12

## Severity

- CISA-ADP CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`
- redhat-SADP CVSS 3.1: 8.1 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.78% probability of exploitation activity in the next 30 days; percentile 55.

## Sources

- [lists.apache.org](https://lists.apache.org/thread/0jfzz9q992957b99tw7hodcqjfyxwb1m)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:37390)
- [GitHub Advisory GHSA-9mrv-8pvf-hf4m](https://github.com/advisories/GHSA-9mrv-8pvf-hf4m)
- [CVE.org record CVE-2026-50627](https://www.cve.org/CVERecord?id=CVE-2026-50627)
- [NVD entry CVE-2026-50627](https://nvd.nist.gov/vuln/detail/CVE-2026-50627)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/06/11/4)
- [access.redhat.com](https://access.redhat.com/security/cve/CVE-2026-50627)
- [RHBZ#2488298](https://bugzilla.redhat.com/show_bug.cgi?id=2488298)
- [security.access.redhat.com](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50627.json)

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Source page: https://erroneo.us/security/cve/CVE-2026-50627/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt