---
id: "CVE-2026-116881"
kind: "vulnerability"
aliases: ["CVE-2026-116881"]
title: "Semantic MediaWiki: stored XSS in property autocomplete dropdown"
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: ["version-7.3.1-or-later"]
published_at: "2026-10-27T11:17:30+00:00"
first_seen_at: "2026-10-27T11:31:27+00:00"
updated_at: "2026-10-27T11:32:06+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116881", "first_seen_at": "2026-10-27T11:31:27+00:00"}]
---

# Semantic MediaWiki: stored XSS in property autocomplete dropdown

Semantic MediaWiki from 3.0.0 before 7.3.1 renders stored semantic property values unescaped in the property-value autocomplete dropdown. When another user opens that autocomplete with an empty query, injected markup or script can run in their browser.

_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 the `composer.lock` entry for `mediawiki/semantic-media-wiki`; versions from `3.0.0` up to but not including `7.3.1` are affected.

## Fix

- Upgrade Semantic MediaWiki to `7.3.1` or later.

## Timeline

- 2026-10-27T11:31:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116881

## From the sources

Semantic MediaWiki from 3.0.0 before 7.3.1 contains a cross-site scripting vulnerability that allows attackers to inject markup by storing malicious semantic property values rendered unescaped in autocomplete suggestions. When another user opens the property-value autocomplete with an empty query, jquery.autocomplete.js concatenates the raw PValueLookup API value into HTML via container.html(), altering the dropdown and potentially executing script.

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