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 47% 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.

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 v3
7.2
EG Score
7.2(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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 computed
Severity72% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
53%
KEV
Not listed

Published

August 27, 2026

Last Modified

September 9, 2026

Advisory Details (9)

Auto-updated Aug 27, 2026
Patch available. Sources: github_release, github, github_commit, github_pr.
generic
https://www.silverstripe.org/download/security-releases/cve-2026-54718
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-rwm3-29jp
github_release Patch Available

7.2.1

Patch available: silverstripe/silverstripe-advancedworkflow 7.2.1

https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.2.1
github_release Patch Available

7.1.3

Patch available: silverstripe/silverstripe-advancedworkflow 7.1.3

https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.1.3
github_release Patch Available

6.4.5

Patch available: silverstripe/silverstripe-advancedworkflow 6.4.5

https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/6.4.5
github_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/630
github_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/629
github_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/f170766af992ed2ed3e5f21d127d0d0d3129678b
github_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/28d0b536491e5c68b1c445579bdd1ddc8beaf8bb

Vendor 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.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
symbiote/silverstripe-advancedworkflow7.2.07.2.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 43× 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.

  1. 2026-09-18 23:26 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 00:32 UTCEG score recompute
  4. 2026-09-17 19:31 UTCEPSS rescore
  5. 2026-09-17 01:35 UTCEG score recompute
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 14:08 UTCEG score recompute
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-15 03:20 UTCEG score recompute
  10. 2026-09-15 03:11 UTCEPSS rescore
  11. 2026-09-13 16:59 UTCEG score recompute
  12. 2026-09-13 16:47 UTCEPSS rescore
  13. 2026-09-12 18:06 UTCEG score recompute
  14. 2026-09-11 19:10 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-10 20:07 UTCEG score recompute
  17. 2026-09-10 09:35 UTCEPSS rescore
  18. 2026-09-09 00:40 UTCEG score recompute
  19. 2026-09-08 22:01 UTCEPSS rescore
  20. 2026-09-08 02:59 UTCEG score recompute
  21. 2026-09-07 16:01 UTCEPSS rescore
  22. 2026-09-06 16:36 UTCEG score recompute
  23. 2026-09-06 13:47 UTCEPSS rescore
  24. 2026-09-05 17:43 UTCEG score recompute
  25. 2026-09-04 18:44 UTCEG score recompute
Show 18 more
  1. 2026-09-04 07:00 UTCEG score recompute
  2. 2026-09-04 05:06 UTCEPSS rescore
  3. 2026-09-02 20:29 UTCEG score recompute
  4. 2026-09-02 14:12 UTCEPSS rescore
  5. 2026-09-01 18:30 UTCEG score recompute
  6. 2026-09-01 13:54 UTCEPSS rescore
  7. 2026-09-01 07:01 UTCEG score recompute
  8. 2026-09-01 04:40 UTCEPSS rescore
  9. 2026-08-31 19:33 UTCEG score recompute
  10. 2026-08-31 18:34 UTCEG score recompute
  11. 2026-08-31 04:42 UTCEG score recompute
  12. 2026-08-30 19:17 UTCEPSS rescore
  13. 2026-08-30 05:48 UTCEG score recompute
  14. 2026-08-30 01:22 UTCEPSS rescore
  15. 2026-08-29 06:52 UTCEG score recompute
  16. 2026-08-28 21:41 UTCEPSS rescore
  17. 2026-08-27 20:27 UTCEG score recompute
  18. 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, with the most recent update on September 9, 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 47.4% 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

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