CVE-2025-26900 CRITICAL

CVE-2025-26900: WordPress Flexmls® IDX Plugin Plugin <= 3.14.27 - PHP Object Injection vulnerability

Vendor Flexmls
Product Flexmls® IDX
Weakness CWE-502 · Unsafe deserialization
Published February 25, 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 flexmls Flexmls® IDX flexmls-idx allows Object Injection.This issue affects Flexmls® IDX: from n/a through <= 3.14.27.

Explanation of Vulnerability in Simple Terms

02Summary

Flexmls IDX versions 3.14.27 and earlier contain a deserialization vulnerability that allows unauthenticated attackers to run 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 arbitrary code on the server and take complete control of the site.

Potential impact on your site

04Site Impact

Complete compromise of the site, including data theft, malware installation, and site defacement.

Conditions required to exploit

05Prerequisites

Network access to the vulnerable Flexmls IDX installation; no authentication required.

Key dates

06Disclosure timeline

February 25, 2025 CVE published
April 28, 2026 Record updated