CVE-2026-57817
Published:August 06, 2026
Updated:September 01, 2026
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.
Affected Packages
org.apache.cxf:cxf-rt-rs-security-sso-oidc (JAVA):
Affected version(s) >=3.0.2.redhat-620062 <3.6.12Fix Suggestion:
Update to version 3.6.12org.apache.cxf:cxf-rt-rs-security-sso-oidc (JAVA):
Affected version(s) >=4.2.0 <4.2.3Fix Suggestion:
Update to version 4.2.3org.apache.cxf:cxf-rt-rs-security-sso-oidc (JAVA):
Affected version(s) >=4.0.0 <4.1.8Fix Suggestion:
Update to version 4.1.8Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Input Validation
EPSS
Base Score:
0.45