CVE-2026-17086
HighCVSS 8.8Exploitation Probability (EPSS)
Elevated risk58th percentile - higher than 58% of all known CVEs
Summary
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.
Risk Assessment
This vulnerability could allow an authenticated attacker to execute code or access sensitive data if an additional plugin or theme containing a POP chain is installed on the site.
Recommendation
Update the ShortPixel Image Optimizer plugin to a version later than 6.5.5 and review installed plugins and themes for the presence of POP chains.
Other vulnerabilities in ShortPixel Image Optimizer
See all- CVE-2026-97246Medium
PHP Object Injection vulnerability in ShortPixel Image Optimizer versions up to 6.5.5, exploitable by a subscriber.
- CVE-2026-39471High
Versions of ShortPixel Image Optimizer up to 6.4.3 are vulnerable to PHP Object Injection attacks, potentially leading to unauthorized system access.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS