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.
CVE-2026-54718
HIGHPre-NVD 7.27.2—
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 7.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7%, top 49% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.2Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.2
- EG Score
- 7.2(medium)
- EG Risk
- 37(Track)EG Risk 37/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity72% × 45%Exploitation1% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 51%
- KEV
- Not listed
Published
August 27, 2026
Last Modified
August 27, 2026
Advisory Details (9)
Auto-updated Aug 27, 2026Patch available. Sources: github_release, github, github_commit, github_pr.
github Patch Available
Remote code execution via advanced workflow email template · Advisory · silverstripe/silverstripe-advancedworkflow · GitHub
https://github.com/silverstripe/silverstripe-advancedworkflow/security/advisories/GHSA-39mm-rwm3-29jpgithub_release Patch Available
7.2.1
Patch available: silverstripe/silverstripe-advancedworkflow 7.2.1
https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.2.1github_release Patch Available
7.1.3
Patch available: silverstripe/silverstripe-advancedworkflow 7.1.3
https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.1.3github_release Patch Available
6.4.5
Patch available: silverstripe/silverstripe-advancedworkflow 6.4.5
https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/6.4.5github_pr Patch Available
[CVE-2026-54718] Prevent RCE via notification email template
Patch available: silverstripe/silverstripe-advancedworkflow 6.4.5 (PR #630 merged 2026-06-24)
https://github.com/silverstripe/silverstripe-advancedworkflow/pull/630github_pr Patch Available
[CVE-2026-54718] Prevent RCE via notification email template
Patch available: silverstripe/silverstripe-advancedworkflow 7.1.3 (PR #629 merged 2026-06-24)
https://github.com/silverstripe/silverstripe-advancedworkflow/pull/629github_commit Patch Available
commit f170766af992 (silverstripe/silverstripe-advancedworkflow)
Patch available: silverstripe/silverstripe-advancedworkflow 6.4.5 (contains commit f170766af992)
https://github.com/silverstripe/silverstripe-advancedworkflow/commit/f170766af992ed2ed3e5f21d127d0d0d3129678bgithub_commit Patch Available
commit 28d0b536491e (silverstripe/silverstripe-advancedworkflow)
Patch available: silverstripe/silverstripe-advancedworkflow 7.1.3 (contains commit 28d0b536491e)
https://github.com/silverstripe/silverstripe-advancedworkflow/commit/28d0b536491e5c68b1c445579bdd1ddc8beaf8bbVendor Advisories for CVE-2026-54718(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 6× in last 7d / 6× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-30 05:48 UTCEG score recompute
- 2026-08-30 01:22 UTCEPSS rescore
- 2026-08-29 06:52 UTCEG score recompute
- 2026-08-28 21:41 UTCEPSS rescore
- 2026-08-27 20:27 UTCEG score recompute
- 2026-08-27 17:23 UTCEG score recompute
Frequently asked(5)
What is CVE-2026-54718?
CVE-2026-54718 is a high vulnerability published on August 27, 2026. 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 was CVE-2026-54718 disclosed?
CVE-2026-54718 was first published in the National Vulnerability Database on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54718 actively exploited?
CVE-2026-54718 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 48.9% of all scored CVEs.
What is the CVSS score of CVE-2026-54718?
CVE-2026-54718 has a CVSS v3 base score of 7.2 (NVD).
How do I remediate CVE-2026-54718?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54718, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-54718
Is Your Infrastructure Affected by CVE-2026-54718?
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