CVE-2026-17086

ShortPixel Image Optimizer <= 6.5.5 - Authenticated (Author+) PHP Object Injection via Nested JSON Post Content

Published Sep 18, 2026 CVSS 3.1 · 8.8 High EPSS 1.3% KEV · Not listed
Description
The ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 6.5.5 via deserialization of untrusted input . This makes it possible for authenticated attackers, with author-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
References
Link Providers
https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L259 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L402 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L425 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L429 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L446 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/class/Controller/Optimizer/OptimizeAiController.php#L598 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L259 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L402 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L425 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L429 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L446 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/class/Controller/Optimizer/OptimizeAiController.php#L598 cve-icon cve-icon
https://plugins.trac.wordpress.org/changeset?reponame=&old=3688579%40shortpixel-image-optimiser&new=3688579%40shortpixel-image-optimiser cve-icon cve-icon
https://www.wordfence.com/threat-intel/vulnerabilities/id/89ef2ee1-2bec-459f-9a85-c260cbb129ca?source=cve cve-icon cve-icon
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Shortpixel
Shortpixel shortpixel Image Optimizer – Optimize Images, Convert Webp & Avif
Wordpress
Wordpress wordpress
Vendors & Products Shortpixel
Shortpixel shortpixel Image Optimizer – Optimize Images, Convert Webp & Avif
Wordpress
Wordpress wordpress
Type Values Removed Values Added
Description The ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 6.5.5 via deserialization of untrusted input . This makes it possible for authenticated attackers, with author-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.
Title ShortPixel Image Optimizer <= 6.5.5 - Authenticated (Author+) PHP Object Injection via Nested JSON Post Content
Weaknesses CWE-502
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Wordfence
Published
Updated
Sep 18, 2026, 2:31 PM
Reserved
Jul 24, 2026, 2:41 PM
Status
Deferred
Published
Sep 18, 2026, 4:17 AM
Modified
Sep 18, 2026, 3:17 PM