CVE-2026-54718
Published:August 27, 2026
Updated:September 24, 2026
Silverstripe Advanced Workflow is a highly configurable step-based workflow module. Prior to 6.4.5, 7.1.3, and 7.2.1, an attacker with permission to author the advanced workflow email template can place a specially crafted server-side template payload in NotifyUsersWorkflowAction.EmailTemplate. When NotifyUsersWorkflowAction renders the field through the Silverstripe template engine SSTemplateParser, the payload can cause PHP evaluation and arbitrary code execution on the server; the regression coverage is in tests/php/WorkflowEngineTest.php. This issue is fixed in versions 6.4.5, 7.1.3, and 7.2.1.
Affected Packages
https://github.com/silverstripe/silverstripe-advancedworkflow.git (GITHUB):
Affected version(s) =7.2.0 <7.2.1Fix Suggestion:
Update to version 7.2.1https://github.com/silverstripe/silverstripe-advancedworkflow.git (GITHUB):
Affected version(s) >=2.0.0 <6.4.5Fix Suggestion:
Update to version 6.4.5https://github.com/silverstripe/silverstripe-advancedworkflow.git (GITHUB):
Affected version(s) >=7.0.0 <7.1.3Fix Suggestion:
Update to version 7.1.3symbiote/silverstripe-advancedworkflow (PHP):
Affected version(s) =7.2.0 <7.2.1Fix Suggestion:
Update to version 7.2.1symbiote/silverstripe-advancedworkflow (PHP):
Affected version(s) >=2.1.0 <6.4.5Fix Suggestion:
Update to version 6.4.5symbiote/silverstripe-advancedworkflow (PHP):
Affected version(s) >=7.0.0 <7.1.3Fix Suggestion:
Update to version 7.1.3symbiote/silverstripe-advancedworkflow (PHP):
Affected version(s) >=dev-dependabot/npm_and_yarn/async-2.6.4 <6.4.5Fix Suggestion:
Update to version 6.4.5symbiote/silverstripe-advancedworkflow (PHP):
Affected version(s) >=7.2.0 <7.2.1Fix Suggestion:
Update to version 7.2.1Related Resources (13)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.2
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.72