CVE-2020-27620
The Cosmos Skin for MediaWiki through 1.35.0 has stored XSS because MediaWiki messages were not being properly escaped.
Does this matter?
Lower severity and a low EPSS score (1.12%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 1.12% probability · 66th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- mediawiki/skin\
- Source
- cve@mitre.org
EPSS 1.1% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.