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Grav CMS CVE-2026-72819

| EUVDEUVD-2026-58633 HIGH
Code Injection (CWE-94)
2026-08-14 VulnCheck GHSA-wvxr-6v52-gfmh
PHP Code Injection 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
8.8 HIGH

Network-accessible upload endpoint; PR:L because a valid authenticated session is required; S:U consistent with CVSS 4.0 SC:N/SI:N/SA:N indicating no lateral scope change.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/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 - 12:32 vuln.today
CVE Published
Aug 14, 2026 - 11:35 cve.org
HIGH 8.7

DescriptionCVE.org

Grav CMS before 2.0.13 contains a remote code execution vulnerability in the Flex Objects plugin settings validation that allows authenticated users to execute arbitrary code by uploading a ZIP file containing PHP code. Attackers can bypass routine name validation by using array notation instead of string notation, call the unZip routine with a malicious archive, and write PHP files to the web root for execution.

AnalysisAI

Remote code execution in Grav CMS before 2.0.13 allows authenticated low-privilege users to plant and execute arbitrary PHP files on the server by exploiting a validation bypass in the Flex Objects plugin. The attacker crafts a ZIP archive containing PHP code, circumvents routine-name validation by substituting array notation for the expected string notation, and triggers the unZip routine to write the payload directly into the web root where it becomes immediately executable via HTTP. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Obtain low-privilege Grav account
Delivery
Access Flex Objects plugin settings endpoint
Exploit
Craft ZIP archive containing PHP webshell
Install
Submit upload with array notation routine name
C2
Bypass string-based validation check
Execute
unZip routine writes PHP file to web root
Impact
Request planted file via HTTP to execute code
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid authenticated user session with at least low-privilege access to the Grav admin interface, consistent with CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) accurately represents the combination of network accessibility and full-system impact; the primary risk mitigator embedded in the vector is PR:L, meaning exploitation is gated behind a valid authenticated session. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with a low-privilege registered account - such as a site editor or contributor - logs into an exposed Grav admin panel running a vulnerable version with the Flex Objects plugin active. The attacker constructs a ZIP archive embedding a PHP webshell, then submits an upload request to the Flex Objects settings endpoint with the unZip routine name supplied in array notation to bypass string-based validation. …
Remediation Upgrade Grav CMS to version 2.0.13 or later; this is the vendor-confirmed fix as documented in the GitHub Security Advisory GHSA-r94f-hx44-8jqf at https://github.com/getgrav/grav/security/advisories/GHSA-r94f-hx44-8jqf. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Grav CMS deployments and document current versions to identify systems at risk. …

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CVE-2026-72819 vulnerability details – vuln.today
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