CVE-2026-50631: high-severity vulnerability in Apache CXF
Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.4epss 0.3%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products
Apache Software Foundation · Apache CXFRelated CVEs — Apache CXF
In the same product, most dangerous first.
CVE-2020-13954—Apache CXF Reflected XSS in the services listing page via the styleSheetPathEPSS 40.9%CVE-2017-5653—CVE-2017-5653EPSS 11.2%CVE-2018-8039—CVE-2018-8039EPSS 8.5%CVE-2016-6812—CVE-2016-6812EPSS 7.5%CVE-2016-8739—CVE-2016-8739EPSS 7.3%CVE-2021-30468—Apache CXF Denial of service vulnerability in parsing JSON via JsonMapObjectReaderWriterEPSS 7.0%