---
id: "CVE-2026-126566"
page: "https://infrastack.ai/live/CVE-2026-126566"
kind: "vulnerability"
aliases: ["CVE-2026-126566"]
title: "Semantic MediaWiki: editors can remove admin page protection via templates"
severity: "high"
cvss: 7.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["mediawiki", "package", "self-hosted", "semantic-mediawiki", "wiki"]
not_affected_if: ["semantic-mediawiki-not-installed", "version-outside-range"]
published_at: "2026-11-11T03:16:51+00:00"
first_seen_at: "2026-11-11T03:25:00+00:00"
updated_at: "2026-11-11T03:26:21+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126566", "first_seen_at": "2026-11-11T03:25:00+00:00"}]
exploit_sources: []
---

# Semantic MediaWiki: editors can remove admin page protection via templates

Link for people: https://infrastack.ai/live/CVE-2026-126566 (this .md is for agents)

Semantic MediaWiki's protection update logic checks changes against the page's latest revision author instead of the actual user. An editor can add a #set call in a transcluded template to clear edit and move protection that an administrator set, with the change logged under the administrator's name.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Semantic MediaWiki version in the wiki's Special:Version page or `composer show mediawiki/semantic-media-wiki`
- Confirm whether the wiki uses the EditProtectionUpdater code path with protected pages (unknown from sources beyond the affected range)

## Fix

- Semantic MediaWiki `7.4.1` or later (the affected range is 7.3.1 before 7.4.1)

## Timeline

- 2026-11-11T03:25:00+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-126566

## Documents

- [advisory] Vendor advisory: github.com https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-gh59-2vh3-6cgm
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/semantic-mediawiki-7.3.1-before-7.4.1-incorrect-authorization-via-edit-protection-annotations
- [fix] Patch: github.com https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/32ca6d8fc75735aa7a2ecc573886391da126da9b
- [fix] Release notes: github.com https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.4.1

## From the sources

Semantic MediaWiki 7.3.1 before 7.4.1 contains an incorrect authorization vulnerability in EditProtectionUpdater::userMayChangeProtection() that checks protection changes against the page's latest revision author. Editors can add {{#set:Is edit protected=false}} to a transcluded template, removing administrator edit and move protection logged under the administrator's name.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_