CVE-2020-27620

The Cosmos Skin for MediaWiki through 1.35.0 has stored XSS because MediaWiki messages were not being properly escaped. This is related to wfMessage and Html::rawElement, as demonstrated by CosmosSocialProfile::getUserGroups.

• CWE-79

• https://gerrit.wikimedia.org/r/c/mediawiki/skins/Cosmos/+/634749Vendor Advisory
• https://gerrit.wikimedia.org/r/c/mediawiki/skins/Cosmos/+/634751Vendor Advisory
• https://gerrit.wikimedia.org/r/c/mediawiki/skins/Cosmos/+/634752Vendor Advisory
• https://phabricator.wikimedia.org/T265440Vendor Advisory
• https://gerrit.wikimedia.org/r/c/mediawiki/skins/Cosmos/+/634749Vendor Advisory
• https://gerrit.wikimedia.org/r/c/mediawiki/skins/Cosmos/+/634751Vendor Advisory
• https://gerrit.wikimedia.org/r/c/mediawiki/skins/Cosmos/+/634752Vendor Advisory
• https://phabricator.wikimedia.org/T265440Vendor Advisory

Published

Oct 22, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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