Vulnerability in Silverstripe Silverstripe-Advancedworkflow
CVE-2026-54718
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 v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Silverstripe Silverstripe-advancedworkflow — versions < 6.4.5, >= 7.0.0, < 7.1.3, >= 7.2.0, < 7.2.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-54718?
- CVE-2026-54718 is a high-severity vulnerability in Silverstripe Silverstripe-Advancedworkflow, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 7.2/10. Published 2026-08-27.
- How severe is CVE-2026-54718?
- High severity. CVSS v3 base score is 7.2 out of 10.