CVE-2026-54718: Symbiote/silverstripe advancedworkflow Remote Code Execution Vulnerability
HIGHCVE-2026-54718 is a HIGH (CVSS 7.2) remote code execution vulnerability (CWE-20: Improper Input Validation) affecting Symbiote/silverstripe advancedworkflow libraries in the Packagist ecosystem. The issue involves silverstripe-advancedworkflow vulnerable to remote code execution via advanced workflow email template. Remediation is available by upgrading affected packages to version 6.4.5, 7.1.3, 7.2.1.
CVE-2026-54718 at a Glance
Security Impact
CVSS: 7.2
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).
How to Fix CVE-2026-54718
To remediate this vulnerability, upgrade all affected Symbiote/silverstripe advancedworkflow dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade symbiote/silverstripe-advancedworkflow to 6.4.5Upgrade symbiote/silverstripe-advancedworkflow to 7.1.3Upgrade symbiote/silverstripe-advancedworkflow to 7.2.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for symbiote/silverstripe-advancedworkflowHow to Check if You Are Affected
To determine whether your application is affected by CVE-2026-54718, inspect your project dependencies for Symbiote/silverstripe advancedworkflow:
inspect dependencies for symbiote/silverstripe-advancedworkflowAnalyze the terminal output to locate any version of Symbiote/silverstripe advancedworkflow in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.4.5), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Symbiote/silverstripe advancedworkflow, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-54718 Affected Symbiote/silverstripe advancedworkflow Versions
3 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
symbiote/silverstripe-advancedworkflow
|
Packagist |
< 6.4.5
|
6.4.5
|
|
symbiote/silverstripe-advancedworkflow
|
Packagist |
≥ 7.0.0
< 7.1.3
|
7.1.3
|
|
symbiote/silverstripe-advancedworkflow
|
Packagist |
≥ 7.2.0
< 7.2.1
|
7.2.1
|
References
Frequently Asked Questions
What is CVE-2026-54718?
Which Symbiote/silverstripe advancedworkflow versions are affected?
What version fixes CVE-2026-54718?
Is symbiote/silverstripe-advancedworkflow affected?
What is the CVSS score of CVE-2026-54718?
What CWE is associated with CVE-2026-54718?
How can I check Packagist dependencies for CVE-2026-54718?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-39mm-rwm3-29jp",
"modified" : "2026-08-27T17:20:40Z",
"published" : "2026-08-27T17:20:40Z",
"aliases" : [ "CVE-2026-54718" ],
"summary" : "silverstripe-advancedworkflow vulnerable to remote code execution via advanced workflow email template",
"details" : "### Impact\nThe advanced workflow email template field is vulnerable to a specially crafted payload that can be used to run arbitrary code on the server.\n\n### Reported by\nSteve Boyd\nSilverstripe Ltd.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Packagist",
"name" : "symbiote/silverstripe-advancedworkflow"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "6.4.5"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Packagist",
"name" : "symbiote/silverstripe-advancedworkflow"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "7.0.0"
}, {
"fixed" : "7.1.3"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Packagist",
"name" : "symbiote/silverstripe-advancedworkflow"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "7.2.0"
}, {
"fixed" : "7.2.1"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/silverstripe/silverstripe-advancedworkflow/security/advisories/GHSA-39mm-rwm3-29jp"
}, {
"type" : "WEB",
"url" : "https://github.com/silverstripe/silverstripe-advancedworkflow/pull/629"
}, {
"type" : "WEB",
"url" : "https://github.com/silverstripe/silverstripe-advancedworkflow/pull/630"
}, {
"type" : "WEB",
"url" : "https://github.com/silverstripe/silverstripe-advancedworkflow/commit/28d0b536491e5c68b1c445579bdd1ddc8beaf8bb"
}, {
"type" : "WEB",
"url" : "https://github.com/silverstripe/silverstripe-advancedworkflow/commit/f170766af992ed2ed3e5f21d127d0d0d3129678b"
}, {
"type" : "WEB",
"url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/symbiote/silverstripe-advancedworkflow/CVE-2026-54718.yaml"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/silverstripe/silverstripe-advancedworkflow"
}, {
"type" : "WEB",
"url" : "https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/6.4.5"
}, {
"type" : "WEB",
"url" : "https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.1.3"
}, {
"type" : "WEB",
"url" : "https://github.com/silverstripe/silverstripe-advancedworkflow/releases/tag/7.2.1"
}, {
"type" : "WEB",
"url" : "https://www.silverstripe.org/download/security-releases/cve-2026-54718"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-1336", "CWE-20" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-08-27T17:20:40Z",
"nvd_published_at" : null
}
}