CVE-2026-61457 | The Grav API plugin (getgrav/grav-plugin-api) before 1.0.3 c… | CVSS 8.8 HIGH

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.

Metadata

CVE ID: CVE-2026-61457
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-09 14:07 UTC
Published: 2026-07-15 11:25 UTC
Last updated: 2026-07-15 12:12 UTC
Primary CWE: CWE-434
Unrestricted Upload of File with Dangerous Type
Vendor / Product: getgrav / grav
Sources: cve.org · NVD

Severity & Metrics

8.8 HIGH CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
getgrav	grav	—	0 < 1.0.3, 1.0.3

Weakness (CWE)

CWE	Source	Description
CWE-434	cna	Unrestricted Upload of File with Dangerous Type

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.8	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.3	MEDIUM	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References (2)

GitHub Security Advisory (GHSA-66v2-vxxf-xc3v) https://github.com/getgrav/grav/security/advisories/GHSA-66v2-vxxf-xc3v
VulnCheck Advisory: Grav before 1.0.3 Remote Code Execution via File Upload Extension Bypass https://www.vulncheck.com/advisories/grav-before-remote-code-execution-via-file-upload-extension-bypass