CVE-2026-54718

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.

CVSS Vector

References

• https://github.com/silverstripe/silverstripe-advancedworkflow/commit/28d0b536491e5c68b1c445579bdd1ddc8beaf8bb
• https://github.com/silverstripe/silverstripe-advancedworkflow/commit/f170766af992ed2ed3e5f21d127d0d0d3129678b
• https://github.com/silverstripe/silverstripe-advancedworkflow/pull/629
• https://github.com/silverstripe/silverstripe-advancedworkflow/pull/630
• https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/6.4.5
• https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.1.3
• https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.2.1
• https://github.com/silverstripe/silverstripe-advancedworkflow/security/advisories/GHSA-39mm-rwm3-29jp
• https://www.silverstripe.org/download/security-releases/cve-2026-54718