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Vulnerability · Published Aug 27, 2026 · Assigned by GitHub_M

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

High 7.2

In plain English

A high-severity security flaw in silverstripe-advancedworkflow from silverstripe. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.2High
Exploit odds (30 days)1.0%top 35.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Packagistsymbiote/silverstripe-advancedworkflow6.4.5GHSA-39mm-rwm3-29jp
Packagistsymbiote/silverstripe-advancedworkflow7.1.3GHSA-39mm-rwm3-29jp
Packagistsymbiote/silverstripe-advancedworkflow7.2.1GHSA-39mm-rwm3-29jp

Affected products (as reported)

VendorProductVersions
silverstripe silverstripe-advancedworkflow < 6.4.5>= 7.0.0, < 7.1.3>= 7.2.0, < 7.2.1

Weakness: CWE-1336 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

References