CVE-2026-54718

Deferred Deferred - Pending Action

Code Execution in Silverstripe Advanced Workflow

Publication date: 2026-08-27

Last updated on: 2026-09-09

Assigner: GitHub, Inc.

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 Scores

EPSS Scores

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Meta Information

Published

2026-08-27

Last Modified

2026-09-09

Generated

2026-09-17

AI Q&A

2026-08-27

EPSS Evaluated

2026-09-15

NVD

CVE-2026-54718

Affected Vendors & Products

Vendor	Product	Version / Range
silverstripe	silverstripe-advancedworkflow	6.4.5
silverstripe	silverstripe-advancedworkflow	7.1.3
silverstripe	silverstripe-advancedworkflow	7.2.1
silverstripe	advanced_workflow	to 6.4.5 (inc)
silverstripe	advanced_workflow	to 7.1.3 (inc)
silverstripe	advanced_workflow	to 7.2.1 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-1336	The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.

Attack-Flow Graph

Executive Summary

This vulnerability is in Silverstripe Advanced Workflow, a module for managing workflows. An attacker with permission to edit email templates can inject malicious server-side template code into the NotifyUsersWorkflowAction.EmailTemplate field. When the template is rendered, the code executes on the server, allowing arbitrary PHP code execution.

Detection Guidance

To detect this vulnerability, check the installed version of the SilverStripe Advanced Workflow module. If your version is below 6.4.5, 7.1.3, or 7.2.1, the system is vulnerable. Use commands like 'composer show symbiote/silverstripe-advancedworkflow' to verify the version.

Impact Analysis

This vulnerability allows an attacker to execute arbitrary code on the server, potentially leading to full system compromise. Attackers could steal data, install malware, or take control of the server. Systems running vulnerable versions are at high risk if attackers have template editing permissions.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR's data protection requirements and HIPAA's security rules. Organizations may face fines, legal penalties, and reputational damage if exploited.

Mitigation Strategies

Update Silverstripe Advanced Workflow to versions 6.4.5, 7.1.3, or 7.2.1 or later to patch the vulnerability.

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