CVE-2025-39551 CRITICAL

CVE-2025-39551: WordPress FluentBoards plugin <= 1.47 - PHP Object Injection Vulnerability

Vendor Mahmudul Hasan Arif
Product FluentBoards
Weakness CWE-502 · Unsafe deserialization
Published April 17, 2025
Last update April 28, 2026
View on NVD All CVEs

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

Deserialization of Untrusted Data vulnerability in Mahmudul Hasan Arif FluentBoards fluent-boards allows Object Injection.This issue affects FluentBoards: from n/a through <= 1.47.

Explanation of Vulnerability in Simple Terms

02Summary

FluentBoards versions 1.47 and earlier contain a deserialization vulnerability that allows unauthenticated attackers to execute arbitrary code on the server. The vulnerability exists because the application deserializes untrusted data without proper validation. An attacker can exploit this remotely over the network without requiring authentication or user interaction.

What an attacker can do

03Attacker Capabilities

Run their own code on the server and take full control of the site.

Potential impact on your site

04Site Impact

Complete compromise of the site, including data theft, malware injection, and loss of availability.

Conditions required to exploit

05Prerequisites

Network access to the FluentBoards installation; no authentication or user interaction required.

Key dates

06Disclosure timeline

April 17, 2025 CVE published
April 28, 2026 Record updated