CVE-2026-61466: Apache CXF: OAuth2 Dynamic Client Registration Scope Self-Escalation
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 4.2.3 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 4.1.8 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 3.6.12
Event History
Frequently Asked Questions
What is the severity of CVE-2026-61466?
CVE-2026-61466 has a risk score of 62, indicating a medium severity.
How do I fix CVE-2026-61466?
To fix CVE-2026-61466, ensure that the OAuth2 Dynamic Client Registration endpoint validates `scope` values against an AS-defined allowlist before accepting them.
What type of vulnerability is CVE-2026-61466?
CVE-2026-61466 is a scope self-escalation vulnerability in Apache CXF's OAuth2 Dynamic Client Registration.
What software is affected by CVE-2026-61466?
CVE-2026-61466 affects the Apache CXF software, specifically its OAuth2 Dynamic Client Registration functionality.
When was CVE-2026-61466 published?
CVE-2026-61466 was published on August 6, 2026.