CVE-2026-57817CWE-20

CVE-2026-57817

High · published August 6, 2026

CVSS v3.1
8.1
EPSS
1%
Percentile
52.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00692 · 52.3th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2026-08-06T15:16Z
Affected products (3)
ProductVersionsFixed in
apache/cxf< 3.6.123.6.12
apache/cxf≥ 4.0.0, < 4.1.84.1.8
apache/cxf≥ 4.2.0, < 4.2.34.2.3
References (2)
https://lists.apache.org/thread/pj63c3pf7kkp1xhr53do704fwj3t3htn · [email protected]http://www.openwall.com/lists/oss-security/2026/08/06/19 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 06 AUG 10:24Z
    Apache CXF: The authorization code hash (c_hash) is not enforced for the hybrid OIDC flow
    cvelistv5