# CVE-2026-54718

## Summary

- **CVE ID:** CVE-2026-54718
- **Severity:** HIGH
- **CVSS Score:** 7.2 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-1336
- **Published:** Aug 27, 2026
- **Last Modified:** Aug 31, 2026

## 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 — silverstripe-advancedworkflow (< 6.4.5)
- silverstripe — silverstripe-advancedworkflow (>= 7.0.0, < 7.1.3)
- silverstripe — silverstripe-advancedworkflow (>= 7.2.0, < 7.2.1)

## References

- [CNA](https://github.com/silverstripe/silverstripe-advancedworkflow/security/advisories/GHSA-39mm-rwm3-29jp)
- [CNA](https://github.com/silverstripe/silverstripe-advancedworkflow/pull/629)
- [CNA](https://github.com/silverstripe/silverstripe-advancedworkflow/pull/630)
- [CNA](https://github.com/silverstripe/silverstripe-advancedworkflow/commit/28d0b536491e5c68b1c445579bdd1ddc8beaf8bb)
- [CNA](https://github.com/silverstripe/silverstripe-advancedworkflow/commit/f170766af992ed2ed3e5f21d127d0d0d3129678b)
- [CNA](https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/6.4.5)
- [CNA](https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.1.3)
- [CNA](https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.2.1)
- [CNA](https://www.silverstripe.org/download/security-releases/cve-2026-54718)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.72%
- **EPSS Percentile:** 51.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._