CVE-2025-64353 HIGH

CVE-2025-64353: WordPress Polylang plugin <= 3.7.3 - Deserialization of untrusted data vulnerability

Vendor Chouby

Product Polylang

Weakness CWE-502 · Unsafe deserialization

Published October 31, 2025

Last update April 28, 2026

View on NVD All CVEs

CVSS base score

8.8/10

Attack vector Network

Attack complexity Low

Privileges required Low

User interaction None

Confidentiality High

Integrity High

CVSS vector

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

What the vulnerability does

01Description

Deserialization of Untrusted Data vulnerability in Chouby Polylang polylang allows Object Injection.This issue affects Polylang: from n/a through <= 3.7.3.

Explanation of Vulnerability in Simple Terms

02Summary

Polylang versions up to 3.7.3 contain a deserialization vulnerability that allows authenticated users to execute arbitrary PHP code on the site. An attacker with low-level access can craft malicious serialized data to trigger code execution. Update to version 3.8.5 or later to patch this issue.

What an attacker can do

03Attacker Capabilities

Run arbitrary PHP code on the site and take full control of it.

Potential impact on your site

04Site Impact

A compromised low-privilege account can lead to complete site takeover, data theft, and malware installation.

Conditions required to exploit

05Prerequisites

Attacker must have a low-privilege user account (e.g., subscriber or contributor role).

Key dates

06Disclosure timeline

October 31, 2025 CVE published

April 28, 2026 Record updated

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2025-64353 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/502.html AskarLabs — CWE-502 write-up Deserialization of Untrusted Data

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