Vulnerabilities CVE-2026-50631

CVE-2026-50631

None

Open

TLP:CLEAR

Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing

NVD CVE.org

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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.

Details

EPSS Score ⓘ: 0.29%

21.6th percentile
Confidence: 90%
Published: Jun 12, 2026
Last Modified: Aug 7, 2026

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