GHSA-83r6-96m8-r52p

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    GHSA-83r6-96m8-r52p

    Published: 12 Jun 2026Last Modified: 20 Aug 2026

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

    Details: 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.

    References: https://nvd.nist.gov/vuln/detail/CVE-2026-50631, https://github.com/apache/cxf, https://lists.apache.org/thread/s83t3x4r626o9h8rt0ryr1w7w53l1vv8, http://www.openwall.com/lists/oss-security/2026/06/11/8

    Affected packages

    Package

    Name: org.apache.cxf:cxf-rt-rs-security-oauth2

    Purl: pkg:maven/org.apache.cxf/cxf-rt-rs-security-oauth2

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 4.2.0
    Fixed -4.2.2

    Affected versions

    4.2.0
    4.2.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    GHSA-83r6-96m8-r52p | CVE-DB