---
id: CVE-2026-77610
title: >-
  Semantic MediaWiki is a free, open-source extension to MediaWiki that lets
  users store and query data within the wiki's pages
summary: >-
  Semantic MediaWiki is a free, open-source extension to MediaWiki that lets
  users store and query data within the wiki's pages. Prior to version 7.2.0,
  query debug output (`format=debug`, or the `debug` request parameter on
  `Special:Ask`)…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: SemanticMediaWiki
product: SemanticMediaWiki
affected:
  - SemanticMediaWiki < 7.2.0
patched:
  - mediawiki/semantic-media-wiki 7.2.0
published: '2026-09-18'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:22:19.873'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77610'
references:
  - url: 'https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-q5fm-9mx6-44f4
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-q5fm-9mx6-44f4'
tags:
  - nvd
  - cve.org
  - ghsa
  - composer
epss: 0.00263
epssPercentile: 0.16152
aliases:
  - GHSA-q5fm-9mx6-44f4
ecosystem: composer
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T19:30:37.465065Z'
ingestedAt: '2026-09-18T17:46:41.524Z'
---

## Overview

Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki's pages. Prior to version 7.2.0, query debug output (`format=debug`, or the `debug` request parameter on `Special:Ask`) is assembled by `SMW\Query\DebugFormatter` and emitted as raw HTML. Several of its sinks apply no output-context encoding, so attacker-controlled query input is reflected into the page without escaping. On `Special:Ask` the resulting string is concatenated into the page and sent through `OutputPage::addHTML`, never through the MediaWiki parser or Sanitizer. No special user right is required; an anonymous request suffices. This is a reflected XSS: the payload is taken from the request and echoed in the same response. Exploitation requires the query condition to target a text/blob-typed property (whose value is re-serialized verbatim); the predefined `_txt` properties (`Text`, etc.) that ship on every install satisfy this, so no attacker-created content is needed. Version 7.2.0 patches the issue.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-77610)

Affected packages:

- `mediawiki/semantic-media-wiki <= 7.1.0`

Patched in:

- `mediawiki/semantic-media-wiki 7.2.0`

Source: https://github.com/advisories/GHSA-q5fm-9mx6-44f4