CVE-2026-54718

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

Published: Aug 27, 2026Updated: Sep 9, 2026 Sources: CVE List NVDCWE-1336

7.2HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:HPrivileges Required

High

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

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Weaknesses

CWE-1336

Affected Products

silverstripe

commercialaka silverstripe cms, silverstripe framework

silverstripe-advancedworkflowOn-prem

Web & CMS Plugins / cms-core

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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References

https://github.com/silverstripe/silverstripe-advancedworkflow/security/advisories/GHSA-39mm-rwm3-29jp

github.com

https://github.com/silverstripe/silverstripe-advancedworkflow/pull/629

github.com

https://github.com/silverstripe/silverstripe-advancedworkflow/pull/630

github.com

and 6 more references View all →

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