Reported vulnerability

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

Q: Which versions of ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF are affected?

Wordfence lists these affected versions: Start version unspecified, before 5.4.2. Use the version checker above to compare your installed release with this report.

Q: Is a fix available for ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF?

Wordfence reports a fix for this issue in ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF. It lists these fixed versions: 5.4.2. Back up your website and test the recommended update before applying it to your live site.

Q: Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Published 14 Sept 2023

Updated 22 Jan 2024

Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.

Does this affect my version?

Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.

Wordfence advisory

medium · CVSS 6.6

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.

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

ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF

Software: plugin · shortpixel-image-optimiser
Affected versions: Start version unspecified, before 5.4.2
Fix availability: Fix available
Fixed versions: 5.4.2

Recommended action

Update to version 5.4.2, or a newer patched version

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/9f23bf62-6008-4a9c-a7ae-a2e513699684?source=api-prod

Data sources and licences

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Source: Wordfence

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Questions about this vulnerability

Which versions of ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF are affected?

Wordfence lists these affected versions: Start version unspecified, before 5.4.2. Use the version checker above to compare your installed release with this report.

Is a fix available for ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF?

Wordfence reports a fix for this issue in ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF. It lists these fixed versions: 5.4.2. Back up your website and test the recommended update before applying it to your live site.

Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Does an affected version mean my website has been hacked?

An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.

These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.

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