CVE-2026-55790
Published:July 01, 2026
Updated:July 21, 2026
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 Packages
https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=5.0.0 <5.9.23Fix Suggestion:
Update to version 5.9.23https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=4.0.0 <4.17.16Fix Suggestion:
Update to version 4.17.16craftcms/cms (PHP):
Affected version(s) >=4.0.0 <4.17.16Fix Suggestion:
Update to version 4.17.16craftcms/cms (PHP):
Affected version(s) >=5.0.0 <5.9.23Fix Suggestion:
Update to version 5.9.23craftcms/cms (PHP):
Affected version(s) >=4.0.0-RC1 <4.17.16Fix Suggestion:
Update to version 4.17.16craftcms/cms (PHP):
Affected version(s) >=5.0.0-RC1 <5.9.23Fix Suggestion:
Update to version 5.9.23Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.4
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
ACTIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
EPSS
Base Score:
0.31