CVE-2026-61466: CWE-304 Missing Critical Step in Authentication in Apache Software Foundation Apache CXF
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.
AI Analysis
Technical Summary
CVE-2026-61466 identifies a missing critical step in the authentication process of Apache CXF's OAuth2 Dynamic Client Registration endpoint. Specifically, the authorization server does not validate the 'scope' parameter submitted during client registration against an internally defined allowlist. Consequently, malicious clients can register with elevated privileges by specifying unauthorized scopes. This vulnerability affects Apache CXF versions 4.0.0, 4.2.0, all versions prior to 3.6.12, and versions between 4.0.0 and 4.1.8, as well as between 4.2.0 and 4.2.3. The vendor recommends upgrading to versions 4.2.3, 4.1.8, or 3.6.12 to remediate the issue.
Potential Impact
Clients can exploit this vulnerability to self-assign privileged OAuth2 scopes during dynamic client registration, potentially gaining unauthorized access or elevated permissions within systems relying on Apache CXF for OAuth2 authentication. This could lead to unauthorized actions or data exposure depending on the privileges associated with the scopes.
Mitigation Recommendations
Users should upgrade Apache CXF to versions 4.2.3, 4.1.8, or 3.6.12, which contain fixes for this vulnerability. No other mitigation or temporary workaround is indicated. Patch status is confirmed by the vendor's recommended upgrade versions.
CVE-2026-61466: CWE-304 Missing Critical Step in Authentication in Apache Software Foundation Apache CXF
Description
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
pkg:maven/Apache Software Foundation/org.apache.cxf:cxf-rt-rs-security-oauth2Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-61466 identifies a missing critical step in the authentication process of Apache CXF's OAuth2 Dynamic Client Registration endpoint. Specifically, the authorization server does not validate the 'scope' parameter submitted during client registration against an internally defined allowlist. Consequently, malicious clients can register with elevated privileges by specifying unauthorized scopes. This vulnerability affects Apache CXF versions 4.0.0, 4.2.0, all versions prior to 3.6.12, and versions between 4.0.0 and 4.1.8, as well as between 4.2.0 and 4.2.3. The vendor recommends upgrading to versions 4.2.3, 4.1.8, or 3.6.12 to remediate the issue.
Potential Impact
Clients can exploit this vulnerability to self-assign privileged OAuth2 scopes during dynamic client registration, potentially gaining unauthorized access or elevated permissions within systems relying on Apache CXF for OAuth2 authentication. This could lead to unauthorized actions or data exposure depending on the privileges associated with the scopes.
Mitigation Recommendations
Users should upgrade Apache CXF to versions 4.2.3, 4.1.8, or 3.6.12, which contain fixes for this vulnerability. No other mitigation or temporary workaround is indicated. Patch status is confirmed by the vendor's recommended upgrade versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-07-09T14:46:58.308Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a74768abf8831d539a9b730
Added to database: 08/06/2026, 11:56:58 UTC
Last enriched: 08/06/2026, 12:16:40 UTC
Last updated: 08/06/2026, 13:16:56 UTC
Views: 5
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