Cyber Resilience

CVE-2026-50627

CriticalUpdated

Published: 12 June 2026

Published
12 June 2026
Modified
30 June 2026
KEV Added
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Patch
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CVSS Score v3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS Score 0.0042 33.6th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-50627 is a critical-severity Authentication Bypass by Alternate Name (CWE-289) vulnerability in Apache Cxf. Its CVSS base score is 9.1 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 33.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A07:2025 Authentication Failures

EU & UK References

Vulnerability details

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…

more

Confusion/Routing attacks. Users are recommended to upgrade to versions 4.2.2 or 4.1.7, which fixes this issue.

CWE(s)
CWE-289CWE-303

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1550.001 Application Access Token Lateral Movement
Adversaries may use stolen application access tokens to bypass the typical authentication process and access restricted accounts, information, or services on remote systems.
attack.mitre.org →
Why these techniques?

Missing JWT 'aud' validation directly enables replay of valid access tokens across resource servers (T1550.001) via public-facing web apps (T1190).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

Affected Assets

apache
cxf
≤ 4.1.7 · 4.2.0 — 4.2.2

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References