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CVE Vulnerability Details :
CVE-2026-50631
PUBLISHED
More InfoOfficial Page
Assigner-apache
Assigner Org ID-f0158376-9dc2-43b6-827c-5f631a4d8d09
View Known Exploited Vulnerability (KEV) details
Published At-12 Jun, 2026 | 08:59
Updated At-12 Jun, 2026 | 14:04
Rejected At-
▼CVE Numbering Authority (CNA)
Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing

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.

Affected Products
Vendor
The Apache Software FoundationApache Software Foundation
Product
Apache CXF
Collection URL
https://repo.maven.apache.org/maven2
Package Name
org.apache.cxf:cxf-rt-rs-security-oauth2
Default Status
unaffected
Versions
Affected
  • From 4.2.0 before 4.2.2 (semver)
  • From 0 before 4.1.7 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-367CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
Type: CWE
CWE ID: CWE-367
Description: CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Textual description of severity
text:
low
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Guanping Zhang reported this vulnerability.
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://lists.apache.org/thread/s83t3x4r626o9h8rt0ryr1w7w53l1vv8
vendor-advisory
Hyperlink: https://lists.apache.org/thread/s83t3x4r626o9h8rt0ryr1w7w53l1vv8
Resource:
vendor-advisory
▼Authorized Data Publishers (ADP)
1. CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
http://www.openwall.com/lists/oss-security/2026/06/11/8
N/A
Hyperlink: http://www.openwall.com/lists/oss-security/2026/06/11/8
Resource: N/A
2. CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
3.17.4HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Version: 3.1
Base score: 7.4
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found