Vulnerability · Published Sep 25, 2026 · Assigned by wikimedia-foundation

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

Critical 10.0

In plain English

A critical-severity OS command injection in Mediawiki - ExternalData Extension from Wikimedia Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 4.0)10.0Critical

Exploit odds (30 days)1.2%top 31.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack tooling1Public PoC

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Wikimedia Foundation	Mediawiki - ExternalData Extension	* – before 3.7

Weakness: CWE-78 · Vector: 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

In plain English

Official description

Affected products (as reported)

References