CVE-2026-63687

CVE Details

Release Date:	2026-08-06
Impact:	Important	What is this?

Description

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.

See more information about CVE-2026-63687 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.1
Vector String:	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Version:	3.1
Attack Vector:	Network
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	Low
Integrity Impact:	High
Availability Impact:	None

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (ovirt-engine-wildfly)	ELSA-2026-500570	2026-11-04
Oracle Linux version 8 (ovirt-engine-wildfly-overlay)	ELSA-2026-500570	2026-11-04
Oracle Linux version 9 (ovirt-engine-wildfly)	ELSA-2026-500571	2026-11-04
Oracle Linux version 9 (ovirt-engine-wildfly-overlay)	ELSA-2026-500571	2026-11-04