Apache CXF: OAuth2 Dynamic Client Registration Scope Self-Escalation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-61466
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-06 12:16:27 UTC
Updated2026-08-07 00:16:34 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.004400000 probability, percentile 0.362160000 (date 2026-08-09)

Problem Types: CWE-304 | CWE-304 CWE-304 Missing Critical Step in Authentication

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Apache Cxf All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache CXF affected 3.6.12 semver Not specified
CNA Apache Software Foundation Apache CXF affected 4.0.0 4.1.8 semver Not specified
CNA Apache Software Foundation Apache CXF affected 4.2.0 4.2.3 semver Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/08/06/21 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
lists.apache.org/thread/2l1r16g79tpxd7fzrzr2q9oscwrjgljs [email protected] lists.apache.org Mailing List, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Guanping Zhang reported this vulnerability. (en)

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