What’s Vulnerable › Vulnerabilities

CVE-2026-54718: Silverstripe Advanced Workflow: Remote code execution via advanced workflow email template

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-27 · updated 2026-09-09
• Weakness: CWE-1336

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.

Affected products

• silverstripe-advancedworkflow: before 6.4.5; from 7.0.0, < 7.1.3; from 7.2.0, < 7.2.1

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

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