High severity · published Jul 1, 2026
CVE-2026-55790
Craft CMS: DOM XSS via GitHub issue title in CraftSupport widget
7.4
CVSS
0.5%
EPSS
No
On KEV
Description
Craft CMS is a content management system (CMS). In versions 5.0.0-RC1 through 5.9.22 and 4.0.0-RC1 through 4.17.15, an attacker with only a GitHub account can plant a JavaScript payload in a craftcms/cms issue title. When a Craft admin uses the CraftSupport widget’s "Give feedback" screen and types a search term that returns the poisoned issue, the payload executes in the admin’s control panel session. No control panel account or elevated privileges are required on the attacker’s side. This issue has been fixed in versions 4.17.16 and 5.9.23.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% 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, < 5.9.23; >= 4.0.0-RC1, < 4.17.16 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55790
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55790
github.com
https://github.com/craftcms/cms/commit/6bbb66038a268552180ca5c8eed9f46ea25a4417
github.com
https://github.com/craftcms/cms/security/advisories/GHSA-24x4-j6x9-rfw5
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