CVE-2026-42756 CRITICAL

CVE-2026-42756: WordPress QuickWebP – Compress / Optimize Images & Convert WebP | SEO Friendly plugin <= 3.2.7 - Arbitrary File Deletion vulnerability

Vendor Ludwig You
Product QuickWebP &#8211; Compress / Optimize Images &amp; Convert WebP | SEO Friendly
Weakness CWE-22 · Path traversal
Published May 27, 2026
Last update May 27, 2026

CVSS base score

9.9/10
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:C/C:H/I:H/A:H

What the vulnerability does

01Description

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Ludwig You QuickWebP &#8211; Compress / Optimize Images &amp; Convert WebP | SEO Friendly quickwebp allows Path Traversal.This issue affects QuickWebP &#8211; Compress / Optimize Images &amp; Convert WebP | SEO Friendly: from n/a through <= 3.2.7.

Explanation of Vulnerability in Simple Terms

02Summary

QuickWebP versions up to 3.2.7 contain a path traversal vulnerability that allows authenticated users to read, write, or delete arbitrary files on the server. An attacker with low-level access can navigate outside intended directories to access sensitive files, configuration data, or other users' content. The vulnerability affects confidentiality, integrity, and availability of the entire site.

What an attacker can do

03Attacker Capabilities

Read, write, or delete any file on the server that the web process can access.

Potential impact on your site

04Site Impact

Any authenticated user can compromise your entire site by accessing config files, database backups, or other users' data.

Conditions required to exploit

05Prerequisites

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

Key dates

06Disclosure timeline

May 27, 2026 CVE published
May 27, 2026 Record updated

Related vulnerabilities

08Related CVE