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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2026-61466- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Weakness
- CWE-304
- Updated
- 2026-11-02
EUVDEUVD-2026-53861
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.
- Record
EUVD-2026-53861- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-pwwh-3685-58r7
In Apache CXF's OAuth2 Dynamic Client Registration endpoint, the authorization server accepts and...
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.
- Record
GHSA-pwwh-3685-58r7- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Weakness
- CWE-304
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-61466- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Weakness
- CWE-304
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2026-61466- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Weakness
- CWE-304
- Updated
- 2026-11-02
OSVRHLW-2026-fd244c7ea4e4e9e4
Lightwell Security Advisory: cxf-rt-rs-security-oauth2 3.6.9.rhlw-00003
Red Hat Lightwell has released org.apache.cxf:cxf-rt-rs-security-oauth2 3.6.9.rhlw-00003 with backported fixes for CVE-2026-50623, CVE-2026-50627, CVE-2026-50628, CVE-2026-50629, CVE-2026-50630, CVE-2026-50631, CVE-2026-57818, CVE-2026-61466, CVE-2026-63687, CVE-2026-68079, and CVE-2026-68481.
CVE-2026-50623: Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService
CVE-2026-50627: Apache CXF: OAuth2: Missing JWT Audience and Issuer Validation in Access Token Validator
CVE-2026-50628: Apache CXF: OAuth2: Inverted IP Binding Check Defeats Security Control
CVE-2026-50629: Apache CXF: OAuth2: Log Injection via Unsanitized Client Identifier
CVE-2026-50630: Apache CXF: OAuth2: HTTP Response Splitting via WWW-Authenticate Realm Injection
CVE-2026-50631: Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing
CVE-2026-57818: Apache CXF: OAuth2 Authorization Code Replay via TOCTOU in JCacheCodeDataProvider
CVE-2026-61466: Apache CXF: OAuth2 Dynamic Client Registration Scope Self-Escalation
CVE-2026-63687: Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters
CVE-2026-68079: Apache CXF: DefaultEncryptingCodeDataProvider allows unlimited authorization code replay
CVE-2026-68481: Apache CXF: Revocation bypass in DefaultEncryptingOAuthDataProvider
This patched artifact is a drop-in replacement for org.apache.cxf:cxf-rt-rs-security-oauth2 3.6.9 from Maven Central.
- Record
RHLW-2026-fd244c7ea4e4e9e4- CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.apache.cxf:cxf-rt-rs-security-oauth2Red Hat Lightwell:Maven From an advisory covering 11 CVEs |
before 3.6.9.rhlw-00003, plus listed versions 2.6.02.6.12.6.102.6.112.6.12 Show 45 moreShow less2.6.132.6.142.6.152.6.162.6.172.6.22.6.32.6.42.6.52.6.62.6.72.6.82.6.92.7.02.7.12.7.102.7.112.7.122.7.132.7.142.7.152.7.162.7.172.7.182.7.22.7.32.7.42.7.52.7.62.7.72.7.82.7.93.0.03.0.0-milestone13.0.0-milestone23.0.13.0.103.0.113.0.123.0.133.0.143.0.153.0.163.0.23.0.3 |
3.6.9.rhlw-00003 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-61466 is a critical vulnerability (CVSS 9.1) in Apache Cxf, published August 6, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.71%, the 53rd percentile. No source names a fixed version.
References
lists.apache.org/thread/2l1r16g79tpxd7fzrzr2q9oscwrjgljs
openwall.com/lists/oss-security/2026/08/06/21
nvd.nist.gov/vuln/detail/CVE-2026-61466
github.com/advisories/GHSA-pwwh-3685-58r7
repo.maven.apache.org/maven2
Show 41 moreShow less
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50627.json
access.redhat.com/errata/RHSA-2026:37390
Left out here: 87 versions. The JSON record has them.