ShortPixel Image Optimizer <= 5.4.1 - Authenticated(Editor+) PHP Object Injection

6.6
Deserialization of Untrusted Data
CVSS 6.6 (Medium)
Publicly Published September 14, 2023
Last Updated January 22, 2024

Description

The ShortPixel Image Optimizer plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 5.4.1 via deserialization of untrusted input in post content. This allows authenticated attackers with editor capabilities or above to inject a PHP Object. No POP chain is present in the vulnerable plugin. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.

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Vulnerability Details for ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF

Software Type Plugin
Software Slug shortpixel-image-optimiser (view on wordpress.org)
Patched? Yes
Remediation Update to version 5.4.2, or a newer patched version
Affected Version
  • < 5.4.2
Patched Version
  • 5.4.2

Recent vulnerabilities in ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF

# Title CVE ID CVSS Researchers Date
1 ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF <= 6.4.3 - Authenticated (Author+) PHP Object Injection CVE-2026-39471 7.5 daroo April 20, 2026
2 ShortPixel Image Optimizer <= 6.4.3 - Authenticated (Author+) Stored Cross-Site Scripting via Attachment Title CVE-2026-4335 5.4 daroo March 25, 2026
3 ShortPixel Image Optimizer <= 6.4.2 - Authenticated (Editor+) Arbitrary File Read via 'loadFile' Parameter CVE-2026-1246 4.9 0N0ise February 4, 2026
4 ShortPixel Image Optimizer <= 6.3.4 - Authenticated (Contributor+) Settings Import/Export CVE-2025-11378 5.4 Dmitrii Ignatyev October 17, 2025
5 ShortPixel Image Optimizer <= 5.6.3 - Missing Authorization CVE-2024-48044 4.3 Rafie Muhammad October 13, 2024
6 ShortPixel Image Optimizer <= 5.6.3 - Authenticated (Editor+) SQL Injection CVE-2024-48043 4.9 Rafie Muhammad October 13, 2024
7 ShortPixel Image Optimizer <= 4.22.9 - Reflected Cross-Site Scripting 6.1 WPScanTeam June 2, 2022

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