What’s Vulnerable › Vulnerabilities

CVE-2020-27620

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-22 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• mediawiki Skin:Cosmos: through 1.35.0

References

• 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
• 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

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