{
"id": "GHSA-83r6-96m8-r52p",
"aliases": [
"CVE-2026-50631"
],
"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.",
"summary": "Apache CXF OAuth2 TOCTOU Race Condition in Refresh Token Processing",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.2.0"
},
{
"fixed": "4.2.2"
}
]
}
],
"package": {
"name": "org.apache.cxf:cxf-rt-rs-security-oauth2",
"ecosystem": "Maven"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.1.7"
}
]
}
],
"package": {
"name": "org.apache.cxf:cxf-rt-rs-security-oauth2",
"ecosystem": "Maven"
}
}
],
"modified": "2026-08-20T18:32:34Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
}
],
"published": "2026-06-12T12:31:33Z",
"references": [
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50631",
"type": "ADVISORY"
},
{
"url": "https://github.com/apache/cxf",
"type": "PACKAGE"
},
{
"url": "https://lists.apache.org/thread/s83t3x4r626o9h8rt0ryr1w7w53l1vv8",
"type": "WEB"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/06/11/8",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-367"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": "2026-06-12T10:16:23Z",
"github_reviewed_at": "2026-08-20T18:32:34Z"
}
}