CVE-2026-39838

CVE-2026-39838 affects the Wikimedia Foundation MediaWiki ProofreadPage extension . The flaw is due to improper neutralization of input during web page generation , enabling cross-site scripting (XSS) targeting Non-Script Elements. The CVE record notes the issue is tied to the ProofreadPage’s han...

CVE-2026-39838 ProofreadPage improperly sanitizes multiline styles using Sanitizer::checkCSS

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...