CVE-2020-27620 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Reference

https://gerrit.wikimedia.org/r/c/mediawiki/skins/Cosmos/+/634749 https://gerrit.wikimedia.org/r/c/mediawiki/skins/Cosmos/+/634751 https://gerrit.wikimedia.org/r/c/mediawiki/skins/Cosmos/+/634752 https://phabricator.wikimedia.org/T265440

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

6.1