Unauthenticated remote code execution through wikitext in ExternalData (CVE-2026-100382) | HOL Guard CVE

Critical · CVSS 10.0CVE-2026-100382

Unauthenticated remote code execution through wikitext in ExternalData

Answer in brief

CVE-2026-100382 records a Critical severity (CVSS 10.0) vulnerability in Unauthenticated remote code execution through wikitext in ExternalData. The current sources do not mark it as known exploited. The current feed maps Wikimedia Foundation/Mediawiki - ExternalData Extension (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 10.0
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 10.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Wikimedia Foundation/Mediawiki - ExternalData Extension (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Wikimedia Foundation/Mediawiki - ExternalData Extensiongeneric	>=* <3.7	3.7

Recommended response

Check inventory. Check lockfiles and deployed manifests for Wikimedia Foundation/Mediawiki - ExternalData Extension.
Review the reported fix. Update Wikimedia Foundation/Mediawiki - ExternalData Extension to 3.7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.