CVE-2026-55790
High
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.
SeverityHigh
CVSS7.4
Exploit probability—
ProductCraftcms/cms
PublishedJul 1, 2026
First seenJul 1, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- craftcms/cms5.9.23, 4.17.16 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| craftcms/cmsPackagist | 5.0.0-RC1 ≤ v < 5.9.23, 4.0.0-RC1 ≤ v < 4.17.16 | 5.9.23, 4.17.16 |
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