by Kastro
Paper/Archive/CVE-2026-61466

CVE-2026-61466

Apache Software Foundation Apache CXF — Apache CXF: OAuth2 Dynamic Client Registration Scope Self-Escalation

EPSS 0.7%CVSS 9.1
critical.is priorityof 100
38
CVSS 9.1 (ADP)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 53.6.536 × 2010.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Apache CXF< 3.6.123.6.12CNA
Apache CXF4.0.0 – < 4.1.84.1.8CNA
Apache CXF4.2.0 – < 4.2.34.2.3CNA

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

advisorylists.apache.org/thread/2l1r16g79tpxd7fzrzr2q9oscwrjgljsrefopenwall.com/lists/oss-security/2026/08/06/21