CVE-2026-57817
Description
A flaw was found in Apache CXF. When operating in the OpenID Connect Hybrid Flow, Apache CXF does not enforce the validation of the c_hash parameter. This vulnerability allows a remote attacker, through a non-compliant or misconfigured Identity Provider (IdP), to perform Authorization Code Substitution/Injection attacks. Such an attack could lead to unauthorized access or session hijacking.
Statement
This vulnerability has a Low impact on Red Hat products. Apache CXF, as used in Red Hat Enterprise Application Platform, Red Hat JBoss Web Server, and Red Hat build of Apache Camel, is susceptible to Authorization Code Substitution/Injection attacks when integrated with a non-compliant or misconfigured Identity Provider (IdP) that omits the c_hash parameter in the OpenID Connect Hybrid Flow. Exploitation requires a specific misconfiguration of the external IdP.
Mitigation
Mitigation for this issue is either not available or the currently available options do not 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).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.7 | N/A | 8.1 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | Low | N/A | None |
| User Interaction | Required | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | High |
| Integrity Impact | Low | N/A | High |
| Availability Impact | None | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
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