# CVE-2026-100382

RCE via OS command injection in MediaWiki ExternalData extension (<3.7).

- Page: https://www.vulneraibility.com/cve/CVE-2026-100382
- CVSS: 10.0
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 1.21% (percentile 68.9)
- Unvetted proof-of-concept code on GitHub: 1 GitHub proof of concept (first 2026-09-27)
- CISA SSVC: exploitation none, automatable yes, technical impact total (assessed 2026-09-26)
- Weakness: CWE-78
- Published: 2026-09-25

## Affected versions

- Wikimedia Foundation Mediawiki - ExternalData Extension: affected < 3.7

A version outside these ranges is not a statement that it is unaffected.

## Impact

Remote code execution on wiki servers via ExternalData input, enabling full system compromise and data exfiltration.

## Action

Immediate action required

## Recommendation

Upgrade ExternalData to >=3.7 or remove/disable it; audit and isolate affected hosts.

## References

- [other] https://phabricator.wikimedia.org/T434961
- [other] https://gerrit.wikimedia.org/r/c/mediawiki/extensions/ExternalData/+/1326012

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.