Critical severity · published Aug 6, 2026
CVE-2026-61466
Apache CXF: OAuth2 Dynamic Client Registration Scope Self-Escalation
9.1
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
Apache CXF · Apache Software Foundation
before 3.6.12; 4.0.0 before 4.1.8; 4.2.0 before 4.2.3 · source: vendor
CX
Cxf · Apache
before 3.6.12; 4.0.0 before 4.1.8; 4.2.0 before 4.2.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-61466
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-61466
Mailing List
https://lists.apache.org/thread/2l1r16g79tpxd7fzrzr2q9oscwrjgljs
www.openwall.com
http://www.openwall.com/lists/oss-security/2026/08/06/21
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