Vulnerability · Published Jul 15, 2026 · Assigned by VulnCheck

CVE-2026-61457Grav before 1.0.3 Remote Code Execution via File Upload Extension Bypass

High 8.8

In plain English

A high-severity unrestricted file upload in grav from getgrav. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.6%top 50.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

The Grav API plugin (getgrav/grav-plugin-api) before 1.0.3 contains a file upload extension bypass in the API media controller. HandlesMediaUploads::validateFileExtension() inspects only the final file extension via pathinfo($filename, PATHINFO_EXTENSION), so a user with api.media.write permission can upload a file with a double extension such as shell.php.jpg to bypass the dangerous extensions blocklist. The web server may then execute the file as PHP, resulting in remote code execution.

Affected products (as reported)

Vendor	Product	Versions
getgrav	grav	0 – before 1.0.3

Weakness: CWE-434 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-66v2-vxxf-xc3v) vendor-advisory
VulnCheck Advisory: Grav before 1.0.3 Remote Code Execution via File Upload Extension Bypass third-party-advisory