CVE-2026-50631 – Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing

CVE ID :CVE-2026-50631

Published : June 12, 2026, 10:16 a.m. | 1 hour, 6 minutes ago

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, which fixes this issue.

Severity: 0.0 | NA

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