---
id: CVE-2026-103441
title: >-
  Deserialization of untrusted data vulnerability in The Wikimedia Foundation
  MediaWiki Wikibase extension allows Leverage Executable Code in Non-Executable
  Files.


  This issue affects MediaWiki Wikibase extension: 1.46, 1.45, and 1.43.
summary: >-
  Deserialization of untrusted data vulnerability in The Wikimedia Foundation
  MediaWiki Wikibase extension allows Leverage Executable Code in Non-Executable
  Files.


  This issue affects MediaWiki Wikibase extension: 1.46, 1.45, and 1.43.
severity: high
cvss: 7.2
cvssVector: >-
  CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:P/S:N/AU:Y/R:I/V:C/RE:M/U:Red
cwe:
  - CWE-502
vendor: The Wikimedia Foundation
product: MediaWiki Wikibase extension
affected:
  - mediawiki_wikibase_extension 1.46
  - mediawiki_wikibase_extension 1.45
  - mediawiki_wikibase_extension 1.43
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T16:27:40.143'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103441'
references:
  - url: 'https://gerrit.wikimedia.org/r/q/Id35bf747e48370e474d9b9444bd7520b24836e8d'
    label: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
  - url: 'https://phabricator.wikimedia.org/T435210'
    label: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-30T17:13:20.822Z'
---

## Overview

Deserialization of untrusted data vulnerability in The Wikimedia Foundation MediaWiki Wikibase extension allows Leverage Executable Code in Non-Executable Files.

This issue affects MediaWiki Wikibase extension: 1.46, 1.45, and 1.43.

## Remediation

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