---
id: "CVE-2026-116889"
kind: "vulnerability"
aliases: ["CVE-2026-116889"]
title: "SemanticMediaWiki: stored XSS via Code-typed property values on Special:Browse"
severity: "medium"
cvss: 6.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["mediawiki", "package", "self-hosted", "semantic-mediawiki"]
not_affected_if: ["no-code-typed-properties", "no-semantic-mediawiki", "patched-version"]
published_at: "2026-10-27T11:17:31+00:00"
first_seen_at: "2026-10-27T11:31:27+00:00"
updated_at: "2026-10-27T11:32:02+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116889", "first_seen_at": "2026-10-27T11:31:27+00:00"}]
---

# SemanticMediaWiki: stored XSS via Code-typed property values on Special:Browse

SemanticMediaWiki versions from 2.5.0 before 7.3.1 fail to escape HTML in Code-typed property values when rendered on Special:Browse. A user with page-edit rights can store a JSON value containing markup that runs JavaScript in the sessions of anyone who views that page.

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

## How to check

- Check the installed SemanticMediaWiki version in the wiki's Special:Version page or `composer show mediawiki/semantic-media-wiki`
- Look for Code-typed properties on the wiki that hold HTML markup

## Fix

- Upgrade SemanticMediaWiki to `7.3.1` or later
- Until upgraded, restrict page-edit rights to trusted editors

## Timeline

- 2026-10-27T11:31:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116889

## From the sources

SemanticMediaWiki from 2.5.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows users with page-edit rights to inject script through Code-typed property values. Attackers can annotate a valid JSON value embedding HTML markup, which the CodeStringValueFormatter renders unescaped on Special:Browse, executing JavaScript in viewers' sessions.

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