CVE-2026-57817

Severity CVSS v4.0:

Pending analysis

Type:

CWE-20 Input Validation

Publication date:

06/08/2026

Last modified:

07/08/2026

Description

The OpenID Connect Core 1.0 specification mandates that the RP MUST validate the `c_hash` parameter when operating in the Hybrid Flow. If an Apache CXF RP is integrated with a non-compliant or misconfigured Identity Provider (IdP) that omits the `c_hash`, the RP becomes vulnerable to Authorization Code Substitution/Injection attacks. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.10 HIGH
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

8.10

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:apache:cxf::::::::		3.6.12 (excluding)
cpe:2.3:a:apache:cxf::::::::	4.0.0 (including)	4.1.8 (excluding)
cpe:2.3:a:apache:cxf::::::::	4.2.0 (including)	4.2.3 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-57817

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools