Apache CXF OAuth2 TOCTOU Race Condition in Refresh Token Processing
A race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass single-use semantics and generate multiple valid Access Tokens, when 'recycleRefreshTokens' is set to false. A leaked refresh token can be replayed concurrently by multiple attackers or threads. Users are recommended to upgrade to versions 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:H/PR:N/UI:N/S:U/C:H/I:H/A:N- Weakness (CWE)
CWE-367- 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-83r6-96m8-r52p - 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 OAuth2 TOCTOU Race Condition in Refresh Token Processing this entry
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