Silverstripe Advanced Workflow: Remote code execution via advanced workflow email template

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54718
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-27 20:17:49 UTC
Updated2026-09-09 21:09:13 UTC
DescriptionSilverstripe 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.

Risk And Classification

Primary CVSS: v3.1 7.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.007240000 probability, percentile 0.519200000 (date 2026-09-10)

Problem Types: CWE-1336 | CWE-1336 CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.2HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.2HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Silverstripe Silverstripe-advancedworkflow affected < 6.4.5 Not specified
CNA Silverstripe Silverstripe-advancedworkflow affected >= 7.0.0, < 7.1.3 Not specified
CNA Silverstripe Silverstripe-advancedworkflow affected >= 7.2.0, < 7.2.1 Not specified

References

ReferenceSourceLinkTags
github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.1.3 [email protected] github.com
github.com/silverstripe/silverstripe-advancedworkflow/commit/28d0b536491... [email protected] github.com
github.com/silverstripe/silverstripe-advancedworkflow/pull/630 [email protected] github.com
www.silverstripe.org/download/security-releases/cve-2026-54718 [email protected] www.silverstripe.org
github.com/silverstripe/silverstripe-advancedworkflow/pull/629 [email protected] github.com
github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.2.1 [email protected] github.com
github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/6.4.5 [email protected] github.com
github.com/silverstripe/silverstripe-advancedworkflow/commit/f170766af99... [email protected] github.com
github.com/silverstripe/silverstripe-advancedworkflow/security/advisorie... [email protected] github.com
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