CVE-2026-50627

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

9.1 CriticalFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: High
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

4.59%Up 4.6 points since Jun 12, 2026

What each source reports

NVD Score used 9.1

Record: CVE-2026-50627
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness: CWE-289, CWE-303
Updated: 2026-11-05

CVE List 9.1

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

Record: CVE-2026-50627
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness: CWE-289, CWE-303
Updated: 2026-11-02

EUVDEUVD-2026-36395 9.1

Record: EUVD-2026-36395
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-9mrv-8pvf-hf4m 9.1

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

Record: GHSA-9mrv-8pvf-hf4m
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-289, CWE-303
Updated: 2026-11-02

OSV 9.1

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

Record: CVE-2026-50627
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-289
Updated: 2026-11-07

OSVGHSA-9mrv-8pvf-hf4m 9.1

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

Record: GHSA-9mrv-8pvf-hf4m
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-289, CWE-303
Updated: 2026-11-02

OSVRHLW-2026-fd244c7ea4e4e9e4 4.8

Lightwell Security Advisory: cxf-rt-rs-security-oauth2 3.6.9.rhlw-00003

Red Hat Lightwell has released org.apache.cxf:cxf-rt-rs-security-oauth2 3.6.9.rhlw-00003 with backported fixes for CVE-2026-50623, CVE-2026-50627, CVE-2026-50628, CVE-2026-50629, CVE-2026-50630, CVE-2026-50631, CVE-2026-57818, CVE-2026-61466, CVE-2026-63687, CVE-2026-68079, and CVE-2026-68481.

CVE-2026-50623: Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService

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

CVE-2026-50628: Apache CXF: OAuth2: Inverted IP Binding Check Defeats Security Control

CVE-2026-50629: Apache CXF: OAuth2: Log Injection via Unsanitized Client Identifier

CVE-2026-50630: Apache CXF: OAuth2: HTTP Response Splitting via WWW-Authenticate Realm Injection

CVE-2026-50631: Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing

CVE-2026-57818: Apache CXF: OAuth2 Authorization Code Replay via TOCTOU in JCacheCodeDataProvider

CVE-2026-61466: Apache CXF: OAuth2 Dynamic Client Registration Scope Self-Escalation

CVE-2026-63687: Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters

CVE-2026-68079: Apache CXF: DefaultEncryptingCodeDataProvider allows unlimited authorization code replay

CVE-2026-68481: Apache CXF: Revocation bypass in DefaultEncryptingOAuthDataProvider

This patched artifact is a drop-in replacement for org.apache.cxf:cxf-rt-rs-security-oauth2 3.6.9 from Maven Central.

Record: RHLW-2026-fd244c7ea4e4e9e4
CVSS 3.1: 4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`org.apache.cxf:cxf-rt-rs-security-oauth2` Maven	4.2.0 up to 4.2.2	4.2.2
`org.apache.cxf:cxf-rt-rs-security-oauth2` Maven	before 4.1.7	4.1.7
`org.apache.cxf:cxf-rt-rs-security-oauth2` Maven	4.2.0 up to 4.2.2, plus listed versions 4.2.1	4.2.2
`org.apache.cxf:cxf-rt-rs-security-oauth2` Maven	before 4.1.7, plus listed versions 2.6.02.6.12.6.102.6.112.6.12 Show 45 moreShow less 2.6.132.6.142.6.152.6.162.6.172.6.22.6.32.6.42.6.52.6.62.6.72.6.82.6.92.7.02.7.12.7.102.7.112.7.122.7.132.7.142.7.152.7.162.7.172.7.182.7.22.7.32.7.42.7.52.7.62.7.72.7.82.7.93.0.03.0.0-milestone13.0.0-milestone23.0.13.0.103.0.113.0.123.0.133.0.143.0.153.0.163.0.23.0.3	4.1.7
`org.apache.cxf:cxf-rt-rs-security-oauth2` Red Hat Lightwell:Maven From an advisory covering 11 CVEs	before 3.6.9.rhlw-00003, plus listed versions 2.6.02.6.12.6.102.6.112.6.12 Show 45 moreShow less 2.6.132.6.142.6.152.6.162.6.172.6.22.6.32.6.42.6.52.6.62.6.72.6.82.6.92.7.02.7.12.7.102.7.112.7.122.7.132.7.142.7.152.7.162.7.172.7.182.7.22.7.32.7.42.7.52.7.62.7.72.7.82.7.93.0.03.0.0-milestone13.0.0-milestone23.0.13.0.103.0.113.0.123.0.133.0.143.0.153.0.163.0.23.0.3	3.6.9.rhlw-00003

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected
Nov 5, 2026	facts, products, references	NVD
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-50627 is a critical vulnerability (CVSS 9.1) in Apache Cxf, published June 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.59%, the 91st percentile. Fixed in org.apache.cxf:cxf-rt-rs-security-oauth2 4.2.2.

References

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Left out here: 196 versions. The JSON record has them.