Arbitrary File Upload Vulnerability in midi-Synth Plugin for WordPress
CVE-2026-1306

9.8CRITICAL

Key Information:

Vendor

WordPress
Status
Midi-synth
Vendor
CVE Published:
14 February 2026

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 27%

What is CVE-2026-1306?

The midi-Synth plugin for WordPress allows unauthenticated attackers to exploit a vulnerability that permits arbitrary file uploads. This occurs due to inadequate validation of file types and extensions within the 'export' AJAX action in versions up to and including 1.1.0. The lack of security checks makes it feasible for attackers to upload malicious files to a site's server, potentially enabling remote code execution if they can procure a valid nonce. Alarmingly, this nonce is available in frontend JavaScript, making it easily accessible to attackers without authentication.

Affected Version(s)

midi-Synth 0 <= 1.1.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-1306
Created by murrez

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/midi-synth/tag...
https://plugins.trac.wordpress.org/browser/midi-synth/tag...

EPSS Score

27% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Athiwat Tiprasaharn
Itthidej Aramsri
Powpy
Waris Damkham
Peerapat Samatathanyakorn
.