CVE-2026-61466 Apache CXF: OAuth2 Dynamic Client Registration Scope Self-Escalation
Attackers can self-assign privileged scopes during OAuth2 client registration due to missing validation, requiring an upgrade to Apache CXF.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-61466?
CVE-2026-61466 is a critical vulnerability in Apache Cxf, published on 6 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-304
Which versions are affected by CVE-2026-61466?
It affects 1 product.
Products include Apache Cxf.
How do I fix CVE-2026-61466?
Upgrade to a fixed version.
Is CVE-2026-61466 being exploited?
There is no known exploitation of CVE-2026-61466 in the wild and no public exploit code.
Other vulnerabilities in Apache Cxf
- CVE-2012-2379 XML Signature/Encryption Not Validated in Apache CXF
- CVE-2026-66909 Apache CXF: Unsafe deserialization of inbound JMS ObjectMessage
- CVE-2026-68079 Apache CXF: DefaultEncryptingCodeDataProvider allows unlimited authorization code replay
- CVE-2026-50628 Apache CXF: OAuth2: Inverted IP Binding Check Defeats Security Control
- CVE-2025-48913 Apache CXF: Untrusted JMS configuration can lead to RCE
Sources
Also known as GHSA-pwwh-3685-58r7.