CVE-2026-50631
Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing
HIGH 7.4
At a glance
- Source
- NVD
- EPSS
- EPSS 0.29 % · percentile 22 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- apache
- NVD status
- Modified
Description
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 or 3.6.12, which fixes this issue.
Weaknesses (CWE)
- CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N | CISA-ADP |
| CVSS 3.1 | HIGH 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N | NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary) |
Advisories
- GHSA-83r6-96m8-r52p — Apache CXF OAuth2 TOCTOU Race Condition in Refresh Token Processing
European references
- ENISA EUVD · EUVD-2026-36399
- GCVE · GCVE-0-2026-50631
Affected configurations (NVD CPE)
cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:*< 4.1.7cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:*≥ 4.2.0 < 4.2.2
Affected products
| Product | Versions |
|---|---|
| Apache Software Foundation · Apache CXF | affected 4.2.0 < 4.2.2 ; affected 4.0.0 < 4.1.7 ; affected 0 < 3.6.12 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |