Apache CXF OAuth2 HTTP Response Splitting via WWW-Authenticate Realm Injection
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, which fixes this issue.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.apache.cxf:cxf-rt-rs-security-oauth2 | >= 4.2.0, < 4.2.2, < 4.1.7 | 4.2.2, 4.1.7 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-113- Platform
- Java / Kotlin (Maven)
- Package
org.apache.cxf:cxf-rt-rs-security-oauth2- Disclosed
- 12.06.2026
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-xf62-wr5p-5p95 - CC BY 4.0
Vulnerability history: org.apache.cxf:cxf-rt-rs-security-oauth2
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 06.2026 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
- High 2
- Medium 2
Disclosures per year
- 2026: 6
-
Apache CXF OAuth2 HTTP Response Splitting via WWW-Authenticate Realm Injection this entry
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