---
id: CVE-2026-54718
title: >-
  Silverstripe Advanced Workflow is a highly configurable step-based workflow
  module
summary: >-
  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 te…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-1336
  - CWE-20
vendor: symbiote
product: symbiote/silverstripe-advancedworkflow
affected:
  - symbiote/silverstripe-advancedworkflow < 6.4.5
  - 'symbiote/silverstripe-advancedworkflow >= 7.0.0, < 7.1.3'
  - 'symbiote/silverstripe-advancedworkflow >= 7.2.0, < 7.2.1'
patched:
  - symbiote/silverstripe-advancedworkflow 6.4.5
  - symbiote/silverstripe-advancedworkflow 7.1.3
  - symbiote/silverstripe-advancedworkflow 7.2.1
published: '2026-08-27'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54718'
references:
  - url: >-
      https://github.com/silverstripe/silverstripe-advancedworkflow/commit/28d0b536491e5c68b1c445579bdd1ddc8beaf8bb
    label: security-advisories@github.com
  - url: >-
      https://github.com/silverstripe/silverstripe-advancedworkflow/commit/f170766af992ed2ed3e5f21d127d0d0d3129678b
    label: security-advisories@github.com
  - url: 'https://github.com/silverstripe/silverstripe-advancedworkflow/pull/629'
    label: security-advisories@github.com
  - url: 'https://github.com/silverstripe/silverstripe-advancedworkflow/pull/630'
    label: security-advisories@github.com
  - url: >-
      https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/6.4.5
    label: security-advisories@github.com
  - url: >-
      https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.1.3
    label: security-advisories@github.com
  - url: >-
      https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.2.1
    label: security-advisories@github.com
  - url: >-
      https://github.com/silverstripe/silverstripe-advancedworkflow/security/advisories/GHSA-39mm-rwm3-29jp
    label: security-advisories@github.com
  - url: 'https://www.silverstripe.org/download/security-releases/cve-2026-54718'
    label: security-advisories@github.com
  - url: >-
      https://github.com/FriendsOfPHP/security-advisories/blob/master/symbiote/silverstripe-advancedworkflow/CVE-2026-54718.yaml
  - url: 'https://github.com/advisories/GHSA-39mm-rwm3-29jp'
tags:
  - nvd
  - ghsa
  - composer
epss: 0.01047
epssPercentile: 0.62731
aliases:
  - GHSA-39mm-rwm3-29jp
ecosystem: composer
ingestedAt: '2026-08-27T18:06:13.201Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-54718)

Affected packages:

- `symbiote/silverstripe-advancedworkflow < 6.4.5`
- `symbiote/silverstripe-advancedworkflow >= 7.0.0, < 7.1.3`
- `symbiote/silverstripe-advancedworkflow >= 7.2.0, < 7.2.1`

Patched in:

- `symbiote/silverstripe-advancedworkflow 6.4.5`
- `symbiote/silverstripe-advancedworkflow 7.1.3`
- `symbiote/silverstripe-advancedworkflow 7.2.1`

Source: https://github.com/advisories/GHSA-39mm-rwm3-29jp