Vulnerability · Published Jun 12, 2026 · Assigned by apache
CVE-2026-50629Apache CXF: OAuth2: Log Injection via Unsanitized Client Identifier
Medium 5.3
In plain English
A medium-severity security flaw in Apache CXF from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
The 'clientId' parameter from incoming HTTP requests is directly concatenated into OAuth2 server log warning messages without sanitizing control characters. This allows an attacker to inject arbitrary content, including fake log entries, into the server's log files. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.apache.cxf:cxf-rt-rs-security-oauth2 | 4.2.2 | GHSA-f8p7-h97q-7vx7 |
| Maven | org.apache.cxf:cxf-rt-rs-security-oauth2 | 4.1.7 | GHSA-f8p7-h97q-7vx7 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache CXF | 4.2.0 – before 4.2.24.0.0 – before 4.1.70 – before 3.6.12 |
Weakness: CWE-93 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N