Medium severity · published Oct 22, 2020
CVE-2020-27620
The Cosmos Skin for MediaWiki through 1.35.0 has stored XSS because MediaWiki messages were not being properly escaped
6.1
CVSS
1.1%
EPSS
No
On KEV
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
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 66% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SK
Skin:cosmos · Mediawiki
through 1.35.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-27620
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-27620
Vendor Advisory
https://gerrit.wikimedia.org/r/c/mediawiki/skins/Cosmos/+/634749
Vendor Advisory
https://gerrit.wikimedia.org/r/c/mediawiki/skins/Cosmos/+/634751
Vendor Advisory
https://gerrit.wikimedia.org/r/c/mediawiki/skins/Cosmos/+/634752
Vendor Advisory
https://phabricator.wikimedia.org/T265440