Vulnerability in Apache Cxf
CVE-2026-61466
In Apache CXF's OAuth2 Dynamic Client Registration endpoint, the authorization server accepts and stores the `scope` value supplied in the client registration request verbatim, without validating it against an AS-defined allowlist. This could lead to a client self-assigning privileged scopes at registration time. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.
EPSS: 0.004 (36.3th percentile) — read the EPSS interpretation.
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:N/A:H.
Affected products
- Apache Cxf
- Apache Software Foundation Cxf — versions 0, 4.0.0, 4.2.0
Weakness classification (CWE)
References
- security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2026-61466?
- CVE-2026-61466 is a critical-severity vulnerability in Apache Cxf, classified under Missing Critical Step in Authentication. CVSS score: 9.1/10. Published 2026-08-06.
- How severe is CVE-2026-61466?
- Critical severity. CVSS v3 base score is 9.1 out of 10.