---
id: CVE-2026-103446
title: >-
  Authorization bypass through User-Controlled key vulnerability in The
  Wikimedia Foundation MediaWiki WikiLambda extension allows Authentication
  Bypass.


  This issue affects MediaWiki WikiLambda extension: 1.46.
summary: >-
  Authorization bypass through User-Controlled key vulnerability in The
  Wikimedia Foundation MediaWiki WikiLambda extension allows Authentication
  Bypass.


  This issue affects MediaWiki WikiLambda extension: 1.46.
severity: high
cvss: 7.4
cvssVector: >-
  CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/S:N/AU:Y/R:U/V:C/RE:M/U:Amber
cwe:
  - CWE-639
vendor: The Wikimedia Foundation
product: MediaWiki WikiLambda extension
affected:
  - mediawiki_wikilambda_extension 1.46
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T19:05:23.307'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103446'
references:
  - url: 'https://gerrit.wikimedia.org/r/q/If2c05b109672fc65f63372f86c768859dc6639fd'
    label: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
  - url: 'https://phabricator.wikimedia.org/T435086'
    label: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-30T18:17:24.571Z'
---

## Overview

Authorization bypass through User-Controlled key vulnerability in The Wikimedia Foundation MediaWiki WikiLambda extension allows Authentication Bypass.

This issue affects MediaWiki WikiLambda extension: 1.46.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.