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OpenAdvisories
High · 7.4 CVE-2026-55790 EUVD-2026-41209GHSA-24x4-j6x9-rfw5

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

Published Jul 1, 2026 · Updated Jul 2, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
craftcms cms >= 5.0.0-RC1, < 5.9.23, >= 4.0.0-RC1, < 4.17.16 —

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist craftcms/cms >= 5.0.0-RC1, < 5.9.23 5.9.23 GHSA-24x4-j6x9-rfw5
Packagist craftcms/cms >= 4.0.0-RC1, < 4.17.16 4.17.16 GHSA-24x4-j6x9-rfw5

References