Arbitrary file upload in midi-Synth - CVE-2026-1306
Published: February 19, 2026
Vulnerability identifier: #VU123082
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-1306
CWE-ID: CWE-434
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Oleg Klenitskiy
Affected software:
midi-Synth
midi-Synth
Detailed vulnerability description
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to insufficient validation of file during file upload in the "export" AJAX action. A remote attacker can upload a malicious file and execute it on the server.
How to mitigate CVE-2026-1306
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.