HIGH

CVE-2026-57817

CVSS v3

8.1

HIGH

EPSS Score

0.7 %

exploit probability, as of 2026-10-17

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

CVE-2026-57817 Red Hat Product Security1 product fixed · 2 known affected
org.apache.cxf/cxf: Apache CXF: Authorization Code Substitution via missing c_hash validation
cxf as a component of Red Hat JBoss Enterprise Application Platform 7 · cxf as a component of Red Hat JBoss Web Server 5
RHSA-2026:71675 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat Build of Apache Camel 4.18.4 for Spring Boot release.

Full record on NVD

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2026-08-06
Last Modified: 2026-08-07

Frequently asked questions

What is CVE-2026-57817?

Is CVE-2026-57817 actively exploited?

Active exploitation of CVE-2026-57817 has not been confirmed. Its EPSS score was 0.7% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-57817?

CVE-2026-57817 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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