CVE-2025-12674 CRITICAL

CVE-2025-12674: KiotViet Sync <= 1.8.5 - Unauthenticated Arbitrary File Upload

Vendor Mykiot
Product KiotViet Sync
Weakness CWE-434 · Unrestricted file upload
Published November 5, 2025
Last update April 8, 2026

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

The KiotViet Sync plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the create_media() function in all versions up to, and including, 1.8.5. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.

Explanation of Vulnerability in Simple Terms

02Summary

KiotViet Sync versions 1.8.5 and earlier allow unauthenticated attackers to upload arbitrary files to the server over the network without user interaction. An attacker can exploit this to run their own code on the site, read sensitive data, or disrupt service. No authentication or special configuration is required.

What an attacker can do

03Attacker Capabilities

Upload arbitrary files and run code on the server without authentication.

Potential impact on your site

04Site Impact

Complete compromise of the site: attackers can execute code, steal data, or take the site offline.

Conditions required to exploit

05Prerequisites

Network access to the affected KiotViet Sync instance; no authentication required.

Key dates

06Disclosure timeline

November 5, 2025 CVE published
April 8, 2026 Record updated