---
id: "CVE-2026-116888"
kind: "vulnerability"
aliases: ["CVE-2026-116888"]
title: "SemanticMediaWiki: stored XSS via unescaped property group name"
severity: "medium"
cvss: 4.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["mediawiki", "package", "self-hosted", "semantic-mediawiki"]
not_affected_if: ["default-config", "no-smw-schemaedit-users"]
published_at: "2026-10-27T11:17:31+00:00"
first_seen_at: "2026-10-27T11:31:27+00:00"
updated_at: "2026-10-27T11:32:15+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116888", "first_seen_at": "2026-10-27T11:31:27+00:00"}]
---

# SemanticMediaWiki: stored XSS via unescaped property group name

Users with the smw-schemaedit right can save a property group schema whose canonical_name contains script markup. It renders unescaped on Special:Browse, so JavaScript runs in the sessions of anyone who views that page, including administrators.

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

## How to check

- Check the installed SemanticMediaWiki version in Special:Version or composer.lock; affected range is 3.2.0 through 7.3.0.
- Review property group schemas for canonical_name values containing HTML or script tags.

## Fix

- Upgrade SemanticMediaWiki to `7.3.1` or later.
- Until upgraded, restrict the smw-schemaedit right to trusted editors.

## Timeline

- 2026-10-27T11:31:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116888

## From the sources

SemanticMediaWiki from 3.2.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows users with the smw-schemaedit right to inject markup through an unescaped property group schema canonical_name. Attackers can save a schema whose canonical_name holds script markup, which GroupFormatter renders unescaped in Special:Browse headings, executing JavaScript in viewers' sessions including administrators.

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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_