---
id: "CVE-2026-116874"
kind: "vulnerability"
aliases: ["CVE-2026-116874"]
title: "SemanticMediaWiki: reflected XSS in Special:Ask lets attackers run scripts"
severity: "medium"
cvss: 6.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["mediawiki", "package", "self-hosted", "semantic-mediawiki", "wiki"]
not_affected_if: ["extension-not-installed", "version-outside-range"]
published_at: "2026-10-27T11:17:29+00:00"
first_seen_at: "2026-10-27T11:31:27+00:00"
updated_at: "2026-10-27T11:32:07+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116874", "first_seen_at": "2026-10-27T11:31:27+00:00"}]
---

# SemanticMediaWiki: reflected XSS in Special:Ask lets attackers run scripts

SemanticMediaWiki versions from 3.1.0 before 7.3.1 do not escape the default parameter in JsonResultPrinter, so a crafted Special:Ask link can inject JavaScript. A lured user who opens that link runs the script in the wiki's origin, where it can steal sessions or CSRF tokens.

_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 the `composer.lock` file for `mediawiki/semantic-media-wiki`
- Confirm whether the wiki serves Special:Ask with the JSON result printer enabled (unknown from sources)

## Fix

- Upgrade SemanticMediaWiki to `7.3.1` or later
- Until upgraded, unknown from sources whether a configuration workaround exists

## Timeline

- 2026-10-27T11:31:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116874

## From the sources

SemanticMediaWiki from 3.1.0 before 7.3.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject scripts through the unescaped default parameter in JsonResultPrinter. Attackers can lure victims to a crafted Special:Ask link with a zero-result query and request_type=special_page, executing JavaScript in the wiki origin to steal sessions or CSRF tokens.

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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_