What is CVE-2026-63687?

CVE-2026-63687 is a critical-severity vulnerability in Apache Cxf, classified under Insufficient Verification of Data Authenticity. CVSS score: 9.1/10. Published 2026-08-06.

How severe is CVE-2026-63687?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Apache Cxf

CVE-2026-63687

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 cli…

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Apache Cxf
Apache Software Foundation Cxf — versions 4.2.0, 4.0.0, 0

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)

Frequently asked questions

What is CVE-2026-63687?: CVE-2026-63687 is a critical-severity vulnerability in Apache Cxf, classified under Insufficient Verification of Data Authenticity. CVSS score: 9.1/10. Published 2026-08-06.
How severe is CVE-2026-63687?: Critical severity. CVSS v3 base score is 9.1 out of 10.