Apache CXF has Authentication Bypass in OAuth2 TokenIntrospectionService
An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF. Due to a missing 'throw' keyword in the security context check, the introspection endpoint (/services/oauth2/introspect) can be accessed by any unauthenticated network attacker. However note that this is a safeguard only in the case that someone forgot to enable authentication on the service. Users are recommended to upgrade to version 4.2.2 or 4.1.7, which fixes this issue.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.apache.cxf:cxf-rt-rs-security-oauth2 | >= 4.2.0, < 4.2.2, < 4.1.7 | 4.2.2, 4.1.7 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-287- Platform
- Java / Kotlin (Maven)
- Package
org.apache.cxf:cxf-rt-rs-security-oauth2- Disclosed
- 12.06.2026
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-542g-m3fx-q86f - CC BY 4.0
Vulnerability history: org.apache.cxf:cxf-rt-rs-security-oauth2
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 06.2026 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
- High 2
- Medium 2
Disclosures per year
- 2026: 6
-
Apache CXF has Authentication Bypass in OAuth2 TokenIntrospectionService this entry
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