CVE-2026-100382 Unauthenticated remote code execution through wikitext in ExternalData
Unauthenticated attackers can execute arbitrary OS commands via wikitext in the MediaWiki ExternalData extension.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100382?
CVE-2026-100382 is a critical command injection vulnerability in Wikimedia Foundation Mediawiki - ExternalData Extension, published on 25 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-78
Which versions are affected by CVE-2026-100382?
How do I fix CVE-2026-100382?
No fix has been published for CVE-2026-100382 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-100382 being exploited?
There is no known exploitation of CVE-2026-100382 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-vwh3-jq98-4w28.