Dashboard / CVE-2026-63687

CVE-2026-63687

CRITICAL
INFO Priority: 0.03 BB Relevance: 78/100
Published: 2026-08-06 Modified: 2026-10-24 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: High
I: High
A: None

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.

Weakness Classification (1)

Affected Software (3)

VendorProductVersion
apache cxf < 3.6.12
apache cxf 4.0.0 – 4.1.8
apache cxf 4.2.0 – 4.2.3

References & Advisories (2)

Bug Bounty Relevance

78 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

9.1 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS — Exploitation Probability

0.28%
Raw Score 0.002820
Percentile 20.7%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00282
2026-10-28
0.00282

Intelligence Sources

nvd ref →

External Links