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.
References9
- github.com/silverstripe/silverstripe-advancedworkflow/commit/28…
- github.com/silverstripe/silverstripe-advancedworkflow/commit/f1…
- github.com/silverstripe/silverstripe-advancedworkflow/pull/629
- github.com/silverstripe/silverstripe-advancedworkflow/pull/630
- github.com/silverstripe/silverstripe-advancedworkflow/releases/…
- github.com/silverstripe/silverstripe-advancedworkflow/releases/…
- github.com/silverstripe/silverstripe-advancedworkflow/releases/…
- github.com/silverstripe/silverstripe-advancedworkflow/security/…
- www.silverstripe.org/download/security-releases/cve-2026-54718
Metrics
- CVSS 3.1
-
7.2
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 64 · as of 8 November 2026
- CWE
- CWE-1336
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.