Reliance on Untrusted Inputs in a Security Decision Affecting cxf-rt-rs-security-oauth2 package, versions *


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.28% (19th percentile)

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  • Snyk IDSNYK-RHEL9-CXFRTRSSECURITYOAUTH2-19402880
  • published28 Aug 2026
  • disclosed6 Aug 2026

Introduced: 6 Aug 2026

CVE-2026-63687  (opens in a new tab)
CWE-807  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:9 cxf-rt-rs-security-oauth2.

NVD Description

Note: Versions mentioned in the description apply only to the upstream cxf-rt-rs-security-oauth2 package and not the cxf-rt-rs-security-oauth2 package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

Apache CXF's JwtRequestCodeFilter copies all claims from a signed request JWT into the authorization parameter map without excluding security-sensitive parameters. A client that can produce a validly-signed request JWT (e.g., one whose client_secret is known or compromised) can thereby substitute the code_challenge, code_challenge_method, nonce, and state values that were set in the outer HTTP request, undermining PKCE integrity and OpenID Connect replay protection. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.

CVSS Base Scores

version 3.1