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CVE-2026-42607

CriticalPublished

Grav: Remote Code Execution (RCE) via Malicious Plugin ZIP Upload in Direct Install Feature

Published: May 11, 2026
Updated: May 12, 2026
Assigning CNA: GitHub_M
Evidence observed: May 26, 2026

Primary CVSS

9.1/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS probability estimate

3.9%

Low · next 30 days

Percentile: 89.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Grav is a file-based Web platform. Prior to 2.0.0-beta.2, an authenticated user with administrative privileges can achieve Remote Code Execution (RCE) by uploading a specially crafted ZIP file through the "Direct Install" tool. While the system attempts to block direct .php file uploads, it fails to inspect the contents of uploaded ZIP archives. Once a malicious plugin is extracted, it can execute arbitrary PHP code or drop a persistent web shell on the server. This vulnerability is fixed in 2.0.0-beta.2.

Sources

Grav CMS 2.0.0-beta.2 - Remote Code ExecutionExploit
Mustafa Murat Akgül · php · May 26, 2026

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