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CVE-2026-17086

HIGH 8.8 CVSS 3.1
Published
September 18, 2026
Last modified
September 18, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-502
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Affected WordPress components

  • ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF Plugin · shortpixel-image-optimiser
    Confirmed match Active
    Up to and including 6.5.5
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • shortpixel ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF — Up to and including 6.5.5

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L259
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L402
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L425
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L429
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L446
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/class/Controller/Optimizer/OptimizeAiController.php#L598
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L259
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L402
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L425
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L429
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L446
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/class/Controller/Optimizer/OptimizeAiController.php#L598
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?reponame=&old=3688579%40shortpixel-image-optimiser&new=3688579%40shortpixel-image-optimiser
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/89ef2ee1-2bec-459f-9a85-c260cbb129ca?source=cve
  • nvd.nist.gov Official NVD record