CVE-2026-61457
HIGHGrav before 1.0.3 Remote Code Execution via File Upload Extension Bypass
Title source: cnaDescription
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.
References (2)
Core 2
Core References
Vendor Advisory vendor-advisory
GitHub Security Advisory (GHSA-66v2-vxxf-xc3v)
https://github.com/getgrav/grav/security/advisories/GHSA-66v2-vxxf-xc3v
Third Party Advisory third-party-advisory
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
Scores
CVSS v3
8.8
EPSS
0.0046
EPSS Percentile
37.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
total
Details
CWE
CWE-434
Status
published
Products (2)
getgrav/grav
< 1.0.3
getgrav/grav
1.0.3
Published
Jul 15, 2026
Tracked Since
Jul 15, 2026