Medium severity · published Jun 21, 2026
CVE-2026-56381
Craft CMS - Stored XSS via User Group Name in User Permissions Page
4.8
CVSS
0.2%
EPSS
No
On KEV
Description
Craft CMS from version 5.0.0-RC1 contains a stored cross-site scripting vulnerability in the User Permissions page where user group names are rendered without proper HTML escaping. Attackers with admin access can inject arbitrary JavaScript via the user group name field that executes when other users view or edit permissions.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CM
cms · craftcms
5.0.0-RC1 before 5.8.22 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56381
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56381
github.com
https://github.com/craftcms/cms/security/advisories/GHSA-g3hp-vvqf-8vw6
www.vulncheck.com
https://www.vulncheck.com/advisories/craft-cms-stored-xss-via-user-group-name-in-user-permissions-page
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