Silverstripe Advanced Workflow: Remote code execution via advanced workflow email template
Priority LOW 36CWE-1336Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1336.
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 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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01047 64th percentileScored 2026-11-07
Fix Fixed silverstripe-advancedworkflow (silverstripe): 6.4.5, 7.1.3, 7.2.1symbiote/silverstripe-advancedworkflow (Packagist): 6.4.5, 7.1.3, 7.2.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| silverstripe | silverstripe-advancedworkflow | before 6.4.5; 7.0.0 to before 7.1.3; 7.2.0 to before 7.2.1 | 6.4.5, 7.1.3, 7.2.1 | Patch available | CNA |
| — | symbiote/silverstripe-advancedworkflow (Packagist) | before 6.4.5 | 6.4.5 | Patch available | GHSA-39mm-rwm3-29jp |
| — | symbiote/silverstripe-advancedworkflow (Packagist) | 7.0.0 to before 7.1.3 | 7.1.3 | Patch available | GHSA-39mm-rwm3-29jp |
| — | symbiote/silverstripe-advancedworkflow (Packagist) | 7.2.0 to before 7.2.1 | 7.2.1 | Patch available | GHSA-39mm-rwm3-29jp |
- silverstripe-advancedworkflow Vendorsilverstripe Affected before 6.4.5; 7.0.0 to before 7.1.3; 7.2.0 to before 7.2.1 Fixed in 6.4.5, 7.1.3, 7.2.1 Patch available CNA
- symbiote/silverstripe-advancedworkflow (Packagist) Vendor— Affected before 6.4.5 Fixed in 6.4.5 Patch available GHSA-39mm-rwm3-29jp
- symbiote/silverstripe-advancedworkflow (Packagist) Vendor— Affected 7.0.0 to before 7.1.3 Fixed in 7.1.3 Patch available GHSA-39mm-rwm3-29jp
- symbiote/silverstripe-advancedworkflow (Packagist) Vendor— Affected 7.2.0 to before 7.2.1 Fixed in 7.2.1 Patch available GHSA-39mm-rwm3-29jp
Remediation
- Fix · CNA silverstripe-advancedworkflow (silverstripe) Fixed in 6.4.5, 7.1.3, 7.2.1
- Fix · GHSA-39mm-rwm3-29jp symbiote/silverstripe-advancedworkflow (Packagist) Fixed in 6.4.5 Advisory →
- Fix · GHSA-39mm-rwm3-29jp symbiote/silverstripe-advancedworkflow (Packagist) Fixed in 7.1.3 Advisory →
- Fix · GHSA-39mm-rwm3-29jp symbiote/silverstripe-advancedworkflow (Packagist) Fixed in 7.2.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-54718
- 2026-10-03 Alias added: GHSA-39mm-rwm3-29jp
References
Other 11
- https://github.com/silverstripe/silverstripe-advancedworkflow/security/advisories/GHSA-39mm-rwm3-29jp
- https://github.com/silverstripe/silverstripe-advancedworkflow/pull/629
- https://github.com/silverstripe/silverstripe-advancedworkflow/pull/630
- https://github.com/silverstripe/silverstripe-advancedworkflow/commit/28d0b536491e5c68b1c445579bdd1ddc8beaf8bb
- https://github.com/silverstripe/silverstripe-advancedworkflow/commit/f170766af992ed2ed3e5f21d127d0d0d3129678b
- 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://www.silverstripe.org/download/security-releases/cve-2026-54718
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symbiote/silverstripe-advancedworkflow/CVE-2026-54718.yaml
- https://github.com/silverstripe/silverstripe-advancedworkflow
More silverstripe vulnerabilities
- TI-2007-02239 Unspecified vulnerability in the search functionality in SilverStripe 2.0.0 has unknown impact and attack vectors. CVSS 2.0HIGH 10.0
- TI-2019-09110 In SilverStripe through 4.3.3, a missing warning about leaving install.php in a public… CVSS 3.1CRITICAL 9.8
- TI-2019-09070 SQL injection vulnerability in silverstripe/restfulserver module 1.0.x before 1.0.9… CVSS 3.0CRITICAL 9.8
- TI-2019-04049 All versions of SilverStripe 3 prior to 3.6.7 and 3.7.3, and all versions of SilverStripe… CVSS 3.0CRITICAL 9.8
- TI-2022-17852 Silverstripe silverstripe/framework through 4.11 allows SQL Injection. CVSS 3.1HIGH 8.8
- TI-2020-07444 Silverstripe CMS through 4.5 can be susceptible to script execution from malicious upload… CVSS 3.1HIGH 8.8
Sources
- CVE-2026-54718 · CVE Program
- CVE-2026-54718 · NVD
- FIRST EPSS
- GHSA-39mm-rwm3-29jp · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences