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CVE-2026-50630— Apache CXF: OAuth2: HTTP Response Splitting via WWW-Authenticate Realm Injection

AI Predicted 7.5 Difficulty: Easy EPSS 0.40% · P34

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProductVersion RangeStatus
Apache Software FoundationApache CXF4.2.0< 4.2.2affected
4.0.0< 4.1.7affected
< 3.6.12affected
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I. Basic Information for CVE-2026-50630

Vulnerability Information
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Vulnerability Title
Apache CXF: OAuth2: HTTP Response Splitting via WWW-Authenticate Realm Injection
Source: CVE Program / CVE List V5
Vulnerability Description
A CRLF injection vulnerability exists in the OAuth2 AuthorizationUtils class. When constructing the WWW-Authenticate response header, the 'realm' parameter is concatenated without sanitizing Carriage Return (CR) and Line Feed (LF) characters. If an attacker can control the realm value, they can inject arbitrary HTTP headers or split the HTTP response entirely. 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
HTTP头部中CRLF序列转义处理不恰当(HTTP响应分割)
Source: CVE Program / CVE List V5
Vulnerability Title
Apache CXF 输入验证错误漏洞
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至4.2.2之前版本存在输入验证错误漏洞，该漏洞源于OAuth2 AuthorizationUtils类构建WWW-Authenticate响应头时未清理回车(CR)和换行(LF)字符，可能导致攻击者控制realm参数，注入任意HTTP头或分割HTTP响应。
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

VendorProductAffected VersionsCPESubscribe
Apache Software FoundationApache CXF 4.2.0 ~ 4.2.2 -

II. Public POCs for CVE-2026-50630

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III. Intelligence Information for CVE-2026-50630

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Mailing List Discussions for CVE-2026-50630 (1)

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

CVE-2026-50645Apache CXF: No restriction on attachment headers per message
CVE-2026-50634Apache CXF: WS JSON request filter trusts metadata from an unvalidated first signature ent
CVE-2026-50633Apache CXF: JNDI Injection vulnerability in DispatchMDBMessageListenerImpl
CVE-2026-50632Apache CXF: JNDI Injection Vulnerability in JMSConfigFactory
CVE-2026-50631Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing
CVE-2026-50629Apache CXF: OAuth2: Log Injection via Unsanitized Client Identifier
CVE-2026-50628Apache CXF: OAuth2: Inverted IP Binding Check Defeats Security Control
CVE-2026-50627Apache CXF: OAuth2: Missing JWT Audience and Issuer Validation in Access Token Validator
CVE-2026-49875Apache CXF: XML External Entity (XXE) Injection in W3CMultiSchemaFactory and EndpointRefer
CVE-2026-50623Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService

IV. Related Vulnerabilities

Same product: Apache CXF
Same vendor: Apache Software Foundation
Same weakness: CWE-113

V. Comments for CVE-2026-50630

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