CVE-2026-55790

HIGH

Craft CMS: DOM XSS via GitHub issue title in CraftSupport widget

Title source: cna
STIX 2.1

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.

References (2)

Core 2

Scores

CVSS v4 7.4
EPSS 0.0031
EPSS Percentile 23.4%
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (4)
craftcms/cms 4.0.0-RC1 - 4.17.16Packagist
craftcms/cms 5.0.0-RC1 - 5.9.23Packagist
craftcms/cms >= 4.0.0-RC1, < 4.17.16
craftcms/cms >= 5.0.0-RC1, < 5.9.23
Published Jul 01, 2026
Tracked Since Jul 02, 2026