[HIGH] Potential enwiki DOS due to slow WatchedItemStore::countVisitingWatchersMultiple

PKSA-kt9r-ys7h-z4q8 CVE-2019-12473 GHSA-33xw-x3pr-rvqj

Affected package: mediawiki/core

Affected version: >=1.27.0,<1.27.6|>=1.30.0,<1.30.2|>=1.31.0,<1.31.2

Reported by:
GitHub, FriendsOfPHP/security-advisories