CVE-2026-54718

Silverstripe Advanced Workflow: Remote code execution via advanced workflow email template

Published Aug 27, 2026 CVSS 3.1 · 7.2 High EPSS 1.0% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-39mm-rwm3-29jp silverstripe-advancedworkflow vulnerable to remote code execution via advanced workflow email template
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Silverstripe
Silverstripe silverstripe-advancedworkflow
Vendors & Products Silverstripe
Silverstripe silverstripe-advancedworkflow
Type Values Removed Values Added
Description 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.
Title Silverstripe Advanced Workflow: Remote code execution via advanced workflow email template
Weaknesses CWE-1336
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Aug 31, 2026, 6:17 PM
Reserved
Jun 15, 2026, 11:07 PM
Status
Deferred
Published
Aug 27, 2026, 8:17 PM
Modified
Sep 9, 2026, 9:09 PM