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Grav CMS EUVDEUVD-2026-58641

| CVE-2026-72827 HIGH
Improper Neutralization of Special Elements Used in a Template Engine (CWE-1336)
2026-08-14 VulnCheck GHSA-4jrc-qc5x-3wrr
Ssti RCE Grav
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.9 CRITICAL

Network-reachable form submission, low complexity; PR:L for required editor account; S:C because OS-level command execution breaks out of the CMS application boundary.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Aug 14, 2026 - 13:01 EUVD
Analysis Generated
Aug 14, 2026 - 12:28 vuln.today
CVE Published
Aug 14, 2026 - 11:35 cve.org
HIGH 8.7

DescriptionCVE.org

Grav CMS before 2.0.13 contains a server-side template injection vulnerability in email-action parameters that allows low-privileged page editors to execute arbitrary operating-system commands. Attackers can inject Twig payloads using the unsandboxed find filter in email subject, body, to, or from fields to achieve remote code execution when forms are submitted.

AnalysisAI

Server-side template injection in Grav CMS before 2.0.13 allows low-privileged page editors to execute arbitrary operating-system commands via the Twig templating engine. Attackers exploit the unsandboxed find filter in email-action form parameters - injecting Twig payloads into subject, body, to, or from fields - which are evaluated server-side upon form submission, yielding full RCE. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate as low-privileged page editor
Delivery
Locate form with email-action parameters
Exploit
Inject Twig payload into subject, body, to, or from field
Execution
Submit form to trigger server-side Twig evaluation
Persist
Unsandboxed find filter executes OS command
Impact
Arbitrary code runs as web server process
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid Grav CMS page editor account - the minimum authenticated role capable of configuring or submitting forms with email-action parameters. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N) characterizes this as network-reachable with low attack complexity, requiring only low-privileged access and no user interaction - consistent with any authenticated page editor. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A threat actor with a valid Grav page editor account navigates to a form configured with email-action and injects a Twig payload such as `{{ ['id'] | map('system') | join }}` into the email subject or body field. Upon form submission, the unsandboxed `find` filter evaluates the expression server-side, executing the OS command with the privileges of the web server process. …
Remediation Upgrade to Grav CMS 2.0.13 or later, the vendor-released patch confirmed by GitHub Security Advisory GHSA-xx48-97m4-h7qm (https://github.com/getgrav/grav/security/advisories/GHSA-xx48-97m4-h7qm). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Grav CMS installations and document current versions; immediately audit and restrict page editor account assignments to only essential, fully-trusted personnel, and enable comprehensive logging of all page editor activities for forensic review. …

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EUVD-2026-58641 vulnerability details – vuln.today
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