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CVE-2026-57817

Apache CXF: The authorization code hash (c_hash) is not enforced for the hybrid OIDC flow

Published: Aug 6, 2026Updated: Aug 7, 2026 Sources: CVE List NVDCWE-20
8.1HIGH
NVD MITRE
EPSS Score
0.4%
Top 63.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-20

Affected Products

Apache Software Foundation
oss-project·USaka apache foundation
Apache CXFLibrary
OSS Libraries / generic-library
apache
oss-project·USaka apache httpd, apache http server
cxfLibraryLibrary
OSS Libraries / generic-library

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
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References

https://lists.apache.org/thread/pj63c3pf7kkp1xhr53do704fwj3t3htn
lists.apache.org
http://www.openwall.com/lists/oss-security/2026/08/06/19
openwall.com

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