CVE-2026-50627
Description
A flaw was found in Apache CXF. The JwtAccessTokenValidator class fails to properly validate the 'aud' (Audience) claims within incoming JSON Web Token (JWT) access tokens. This vulnerability allows an attacker to reuse a JWT, originally intended for one resource server, against a different resource server. This can lead to token confusion and routing attacks, potentially granting unauthorized access or information disclosure.
Statement
The Red Hat Product Security team has assessed the severity of this vulnerability as Important. Although authentication is required (the attacker must possess a valid JWT issued for some resource server), the flaw allows unauthorized access to protected resources on any other resource server using Apache CXF's JwtAccessTokenValidator, enabling full read/write operations across trust boundaries due to the complete absence of audience claim validation in the default configuration.
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.1 | 9.1 | 9.1 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | Low | High | High |
| User Interaction | None | None | None |
| Scope | Unchanged | Changed | Changed |
| Confidentiality | High | High | High |
| Integrity Impact | High | High | High |
| Availability Impact | None | High | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
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