UnratedApache Software Foundation

Unknown [CVE-2026-50631] Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing

This security Apache Software Foundation advisory covers CVE-2026-50631 affecting Apache CXF.

CVE-2026-50631 Published Jun 12, 2026Updated by vendor Aug 7, 2026

CVE-2026-50631

Affected products & platforms

Apache Software FoundationUnclassified

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Summary

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.

Affected product named by the advisory: Apache CXF.

Affected versions

Apache CXF 4.2.0 before 4.2.2
Apache CXF 4.0.0 before 4.1.7
Apache CXF before 3.6.12

Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source

Fixed versions

4.2.2
4.1.7
3.6.12

Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.

Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Apache Software Foundation
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-50631 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-50631NVD CVE.org MITRE

Official resources

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