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Vulnerability · Published Sep 18, 2026 · Assigned by Wordfence

CVE-2026-17086ShortPixel Image Optimizer <= 6.5.5 - Authenticated (Author+) PHP Object Injection via Nested JSON Post Content

High 8.8

In plain English

A high-severity unsafe deserialization in ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF from shortpixel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 71% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)1.3%top 28.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 products (as reported)

VendorProductVersions
shortpixel ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF 0 – through 6.5.5

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References