CVE-2026-39838
Medium
Description
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows XSS Targeting Non-Script Elements. The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.
SeverityMedium
CVSS6.9
Exploit probability—
ProductMediaWiki - ProofreadPage Extension
PublishedApr 7, 2026
First seenApr 7, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- Wikimedia Foundation MediaWiki - ProofreadPage Extension1.43 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Wikimedia Foundation MediaWiki - ProofreadPage Extension | v < 1.43 | 1.43 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.