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CVE-2026-100382— Unauthenticated remote code execution through wikitext in ExternalData

Quick assessment

Affected
Wikimedia Foundation Mediawiki - ExternalData Extension
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Wikimedia Foundation 的 MediaWiki - ExternalData 扩展中存在“操作系统命令注入”（OS Command Injection）漏洞，该漏洞源于对特殊元素的不当中立化处理，可导致操作系统命令注入。 此问题影响 MediaWiki - ExternalData 扩展：版本 3.7 之前的所有受影响版本。

CVSS 10.0 · Critical EPSS 0.95% · P60

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Wikimedia Foundation Mediawiki - ExternalData Extension *< 3.7 affected
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I. Basic Information for CVE-2026-100382

Vulnerability Information
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Vulnerability Title
Unauthenticated remote code execution through wikitext in ExternalData
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in Wikimedia Foundation Mediawiki - ExternalData Extension allows OS Command Injection. This issue affects Mediawiki - ExternalData Extension: from * before 3.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Wikimedia Foundation Mediawiki - ExternalData Extension * ~ 3.7 -

II. Public POCs for CVE-2026-100382

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III. Intelligence Information for CVE-2026-100382

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Patches & Fixes for CVE-2026-100382 (1)

Other References for CVE-2026-100382 (1)

Same Patch Batch · Wikimedia Foundation · 2026-09-25 · 8 CVEs total

CVE-2026-100377 6.9 MEDIUM Revision-deleted pages can be viewed through WikiLambda's action=edit and Special:ViewAbst
CVE-2026-100381 5.3 MEDIUM UploadWizard Flickr collection and set titles allow DOM XSS
CVE-2026-100380 5.3 MEDIUM Reflected XSS in Wikibase Special:SetLabel language validation
CVE-2026-100378 5.3 MEDIUM Missing permission check in the Translate sandbox doRemind action
CVE-2026-100379 5.3 MEDIUM Cross-request disclosure of CentralAuth cookies in Wikipedia Android App
CVE-2026-100383 4.8 MEDIUM Stored i18n XSS in WikiLambda's VisualEditor integration
CVE-2026-100376 4.8 MEDIUM TemplateSandbox can be abused for XSS by asking another user to preview a page with a cert

IV. Related Vulnerabilities

Same vendor: Wikimedia Foundation
Same weakness: CWE-78

V. Comments for CVE-2026-100382

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