---
id: "CVE-2026-116887"
kind: "vulnerability"
aliases: ["CVE-2026-116887"]
title: "Semantic MediaWiki: stored XSS via Keyword properties on Special:Browse"
severity: "medium"
cvss: 5.4
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["mediawiki", "package", "self-hosted", "semantic-mediawiki"]
not_affected_if: ["edit-rights-restricted-to-trusted-users", "extension-not-installed", "version-7.3.1-or-later"]
published_at: "2026-10-27T11:17:31+00:00"
first_seen_at: "2026-10-27T11:31:27+00:00"
updated_at: "2026-10-27T11:32:11+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116887", "first_seen_at": "2026-10-27T11:31:27+00:00"}]
---

# Semantic MediaWiki: stored XSS via Keyword properties on Special:Browse

Semantic MediaWiki versions 3.0.0 through 7.3.0 render Keyword-typed property values unescaped on Special:Browse. A user with page-edit rights can store an event-handler payload that runs JavaScript in other viewers' sessions, including administrators.

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

## How to check

- Check the installed Semantic MediaWiki version in Special:Version or in the extension's composer.json / extension.json
- Look for an installed version below `7.3.1` (unknown whether the sources give a specific check beyond this)

## Fix

- Upgrade Semantic MediaWiki to `7.3.1` or later
- Until upgraded, restrict page-edit rights to trusted users (unknown whether the sources list a workaround)

## Timeline

- 2026-10-27T11:31:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116887

## From the sources

Semantic MediaWiki from 3.0.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows users with page-edit rights to inject HTML through Keyword-typed property values rendered unescaped on Special:Browse. Attackers can annotate a Keyword property with an event-handler payload that executes JavaScript in viewers' sessions, including administrators, to read tokens and perform actions.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_