---
id: CVE-2026-77606
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,
  when `headers=plain`, table header text was emitted into `<th>` via a raw HTML
  path. U…
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: mediawiki
product: mediawiki/semantic-media-wiki
affected:
  - mediawiki/semantic-media-wiki <= 7.1.0
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-2026-77606'
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-3jp5-3h47-28qf
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-3jp5-3h47-28qf'
tags:
  - nvd
  - ghsa
  - composer
  - cve.org
epss: 0.00263
epssPercentile: 0.16157
aliases:
  - GHSA-3jp5-3h47-28qf
ecosystem: composer
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T14:58:58.191927Z'
ingestedAt: '2026-09-18T16:45:41.402Z'
---

## 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, when `headers=plain`, table header text was emitted into `<th>` via a raw HTML path. User-controlled `mainlabel` content could therefore become executable HTML. Version 7.2.0 fixes the issue.

## Remediation

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

## Package advisory (CVE-2026-77606)

Affected packages:

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

Patched in:

- `mediawiki/semantic-media-wiki 7.2.0`

Source: https://github.com/advisories/GHSA-3jp5-3h47-28qf