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

Quick assessment

Affected
Apache Software Foundation Apache CXF
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache cxf是美国Apache基金会开源的一个Web服务开发框架。 Apache CXF 4.1.7之前版本和4.2.0版本至4.2.2之前版本存在竞争条件问题漏洞，该漏洞源于AbstractOAuthDataProvider存在竞争条件问题，当'recycleRefreshTokens'设置为false时，可能导致多个并发请求使用同一个Refresh Token绕过单次使用语义生成多个有效的Access Token，泄露的refresh token可被多个攻击者或线程同时重放。

AI Predicted 8.1 Difficulty: Hard EPSS 0.39% · P31

Affected Version Matrix 3

VendorProduct Version RangeStatus
Apache Software Foundation Apache CXF 4.2.0< 4.2.2 affected
4.0.0< 4.1.7 affected
< 3.6.12 affected
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I. Basic Information for CVE-2026-50631

Vulnerability Information
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Vulnerability Title
Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing
Source: CVE Program / CVE List V5
Vulnerability 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 or 3.6.12, which fixes this issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
Apache CXF 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache cxf是美国Apache基金会开源的一个Web服务开发框架。 Apache CXF 4.1.7之前版本和4.2.0版本至4.2.2之前版本存在竞争条件问题漏洞，该漏洞源于AbstractOAuthDataProvider存在竞争条件问题，当'recycleRefreshTokens'设置为false时，可能导致多个并发请求使用同一个Refresh Token绕过单次使用语义生成多个有效的Access Token，泄露的refresh token可被多个攻击者或线程同时重放。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache CXF 4.2.0 ~ 4.2.2 -

II. Public POCs for CVE-2026-50631

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III. Intelligence Information for CVE-2026-50631

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Mailing List Discussions for CVE-2026-50631 (1)

Same Patch Batch · Apache Software Foundation · 2026-06-12 · 11 CVEs total

CVE-2026-50645 Apache CXF: No restriction on attachment headers per message
CVE-2026-50634 Apache CXF: WS JSON request filter trusts metadata from an unvalidated first signature ent
CVE-2026-50633 Apache CXF: JNDI Injection vulnerability in DispatchMDBMessageListenerImpl
CVE-2026-50632 Apache CXF: JNDI Injection Vulnerability in JMSConfigFactory
CVE-2026-50630 Apache CXF: OAuth2: HTTP Response Splitting via WWW-Authenticate Realm Injection
CVE-2026-50629 Apache CXF: OAuth2: Log Injection via Unsanitized Client Identifier
CVE-2026-50628 Apache CXF: OAuth2: Inverted IP Binding Check Defeats Security Control
CVE-2026-50627 Apache CXF: OAuth2: Missing JWT Audience and Issuer Validation in Access Token Validator
CVE-2026-49875 Apache CXF: XML External Entity (XXE) Injection in W3CMultiSchemaFactory and EndpointRefer
CVE-2026-50623 Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService

IV. Related Vulnerabilities

Same product: Apache CXF
Same vendor: Apache Software Foundation
Same weakness: CWE-367

V. Comments for CVE-2026-50631

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