CVE-2026-54718 (GCVE-0-2026-54718)
Vulnerability from cvelistv5 – Published: 2026-08-27 17:19 – Updated: 2026-08-27 17:19
VLAI
EPSS
VEX
Title
Silverstripe Advanced Workflow: Remote code execution via advanced workflow email template
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.
Severity
7.2 (High)
CWE
- CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/silverstripe/silverstripe-adva… | x_refsource_CONFIRM |
| https://github.com/silverstripe/silverstripe-adva… | x_refsource_MISC |
| https://github.com/silverstripe/silverstripe-adva… | x_refsource_MISC |
| https://github.com/silverstripe/silverstripe-adva… | x_refsource_MISC |
| https://github.com/silverstripe/silverstripe-adva… | x_refsource_MISC |
| https://github.com/silverstripe/silverstripe-adva… | x_refsource_MISC |
| https://github.com/silverstripe/silverstripe-adva… | x_refsource_MISC |
| https://github.com/silverstripe/silverstripe-adva… | x_refsource_MISC |
| https://www.silverstripe.org/download/security-re… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| silverstripe | silverstripe-advancedworkflow |
Affected:
< 6.4.5
Affected: >= 7.0.0, < 7.1.3 Affected: >= 7.2.0, < 7.2.1 |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"product": "silverstripe-advancedworkflow",
"vendor": "silverstripe",
"versions": [
{
"status": "affected",
"version": "\u003c 6.4.5"
},
{
"status": "affected",
"version": "\u003e= 7.0.0, \u003c 7.1.3"
},
{
"status": "affected",
"version": "\u003e= 7.2.0, \u003c 7.2.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1336",
"description": "CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-27T17:19:51.691Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/silverstripe/silverstripe-advancedworkflow/security/advisories/GHSA-39mm-rwm3-29jp",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/silverstripe/silverstripe-advancedworkflow/security/advisories/GHSA-39mm-rwm3-29jp"
},
{
"name": "https://github.com/silverstripe/silverstripe-advancedworkflow/pull/629",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/silverstripe/silverstripe-advancedworkflow/pull/629"
},
{
"name": "https://github.com/silverstripe/silverstripe-advancedworkflow/pull/630",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/silverstripe/silverstripe-advancedworkflow/pull/630"
},
{
"name": "https://github.com/silverstripe/silverstripe-advancedworkflow/commit/28d0b536491e5c68b1c445579bdd1ddc8beaf8bb",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/silverstripe/silverstripe-advancedworkflow/commit/28d0b536491e5c68b1c445579bdd1ddc8beaf8bb"
},
{
"name": "https://github.com/silverstripe/silverstripe-advancedworkflow/commit/f170766af992ed2ed3e5f21d127d0d0d3129678b",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/silverstripe/silverstripe-advancedworkflow/commit/f170766af992ed2ed3e5f21d127d0d0d3129678b"
},
{
"name": "https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/6.4.5",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/6.4.5"
},
{
"name": "https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.1.3",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.1.3"
},
{
"name": "https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.2.1",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.2.1"
},
{
"name": "https://www.silverstripe.org/download/security-releases/cve-2026-54718",
"tags": [
"x_refsource_MISC"
],
"url": "https://www.silverstripe.org/download/security-releases/cve-2026-54718"
}
],
"source": {
"advisory": "GHSA-39mm-rwm3-29jp",
"discovery": "UNKNOWN"
},
"title": "Silverstripe Advanced Workflow: Remote code execution via advanced workflow email template"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-54718",
"datePublished": "2026-08-27T17:19:51.691Z",
"dateReserved": "2026-06-15T23:07:33.231Z",
"dateUpdated": "2026-08-27T17:19:51.691Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-54718",
"date": "2026-08-28",
"epss": "0.00724",
"percentile": "0.5105"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-54718\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-27T20:17:49.817\",\"lastModified\":\"2026-08-27T20:17:49.817\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"silverstripe\",\"product\":\"silverstripe-advancedworkflow\",\"versions\":[{\"version\":\"\u003c 6.4.5\",\"status\":\"affected\"},{\"version\":\"\u003e= 7.0.0, \u003c 7.1.3\",\"status\":\"affected\"},{\"version\":\"\u003e= 7.2.0, \u003c 7.2.1\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.2,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.2,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-1336\"}]}],\"references\":[{\"url\":\"https://github.com/silverstripe/silverstripe-advancedworkflow/commit/28d0b536491e5c68b1c445579bdd1ddc8beaf8bb\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/silverstripe/silverstripe-advancedworkflow/commit/f170766af992ed2ed3e5f21d127d0d0d3129678b\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/silverstripe/silverstripe-advancedworkflow/pull/629\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/silverstripe/silverstripe-advancedworkflow/pull/630\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/6.4.5\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.1.3\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.2.1\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/silverstripe/silverstripe-advancedworkflow/security/advisories/GHSA-39mm-rwm3-29jp\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://www.silverstripe.org/download/security-releases/cve-2026-54718\",\"source\":\"security-advisories@github.com\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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