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CVE-2026-55792
Published:July 01, 2026
Updated:July 20, 2026
Craft CMS is a content management system (CMS). In versions starting from 4.0.0-RC1 and prior to 4.18.0, and 5.0.0-RC1 and above, prior to 5.10.0, the dataUrl() Twig function is included in Craft’s Twig sandbox allowlist, allowing any control panel user granted the utility:system-messages permission to embed a file-reading payload into system email templates. When those emails are sent, the server reads the target file and returns its contents as a base64-encoded data URL embedded in the email body. The .env file, which typically contains the database password, CRAFT_SECURITY_KEY, and third-party API keys, passes all of Craft’s existing dataUrl() protection checks and is fully exfiltrated. Obtaining CRAFT_SECURITY_KEY enables an attacker to forge session tokens and escalate to full admin account takeover. This issue has been fixed in versions 4.18.0 and 5.10.0.
Affected Packages
https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=5.0.0 <5.10.0
Fix Suggestion:
Update to version 5.10.0
https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=4.0.0 <4.18.0
Fix Suggestion:
Update to version 4.18.0
craftcms/cms (PHP):
Affected version(s) >=4.0.0 <4.18.0
Fix Suggestion:
Update to version 4.18.0
craftcms/cms (PHP):
Affected version(s) >=4.0.0-RC1 <4.18.0
Fix Suggestion:
Update to version 4.18.0
craftcms/cms (PHP):
Affected version(s) >=5.0.0-RC1 <5.10.0
Fix Suggestion:
Update to version 5.10.0
craftcms/cms (PHP):
Affected version(s) >=5.0.0 <5.10.0
Fix Suggestion:
Update to version 5.10.0
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CVSS v4
Base Score:
6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Exposure of Sensitive Information to an Unauthorized Actor
EPSS
Base Score:
0.27