CVE-2026-57817
High
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.
SeverityHigh
CVSS8.1
Exploit probability—
Product
Apache Cxf
PublishedAug 6, 2026
First seenAug 6, 2026
Weakness typeCWE-20Improper input validation
How to fix
Update
- apache cxf3.6.12, 4.1.8, 4.2.3 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| apache cxf | v < 3.6.12, 4.0.0 ≤ v < 4.1.8, 4.2.0 ≤ v < 4.2.3 | 3.6.12, 4.1.8, 4.2.3 |
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