CVE-2026-54718Silverstripe Advanced Workflow: Remote code execution via advanced workflow email template
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No exploitation reported and no EPSS estimate yet.
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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
- 7.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-1336
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Aug 31, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
silverstripe silverstripe-advancedworkflow silverstripe:advancedworkflow (from the name) | before 6.4.5; from 7.0.0, < 7.1.3; from 7.2.0, < 7.2.1 | CNA record |
References
- https://github.com/silverstripe/silverstripe-advancedworkflow/security/advisories/GHSA-39mm-rwm3-29jpx-refsource-confirm
- https://github.com/silverstripe/silverstripe-advancedworkflow/pull/629x-refsource-misc
- https://github.com/silverstripe/silverstripe-advancedworkflow/pull/630x-refsource-misc
- https://github.com/silverstripe/silverstripe-advancedworkflow/commit/28d0b536491e5c68b1c445579bdd1ddc8beaf8bbx-refsource-misc
- https://github.com/silverstripe/silverstripe-advancedworkflow/commit/f170766af992ed2ed3e5f21d127d0d0d3129678bx-refsource-misc
- https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/6.4.5x-refsource-misc
- https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.1.3x-refsource-misc
- https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.2.1x-refsource-misc
- https://www.silverstripe.org/download/security-releases/cve-2026-54718x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.