CVE-2026-39471 ShortPixel CVE debrief

Who should care

Defenders responsible for WordPress installations with the ShortPixel Image Optimizer plugin should assess exposure and prioritize patching or mitigation. This vulnerability may impact the security of WordPress sites using the affected plugin.

Why it matters

CVE-2026-39471 is a PHP object injection vulnerability in ShortPixel Image Optimizer that could lead to arbitrary code execution. Defenders should prioritize patching or mitigating this HIGH-severity vulnerability, especially in WordPress environments using the affected plugin.

• Potential arbitrary code execution
• Possible compromise of WordPress sites using the affected plugin
• Need for input validation and sanitization to prevent PHP object injection
• Priority on patching or mitigating the vulnerability

Technical summary

The ShortPixel Image Optimizer plugin for WordPress is vulnerable to PHP object injection in versions up to 6.4.3. This vulnerability allows an attacker to inject malicious PHP objects, which could potentially lead to arbitrary code execution. The vulnerability is caused by the plugin's insecure handling of user input, allowing an attacker to inject malicious PHP objects.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially in environments where the ShortPixel Image Optimizer plugin is used.

Recommended defensive actions

• Patch or update ShortPixel Image Optimizer to a version beyond 6.4.3
• Implement input validation and sanitization to prevent PHP object injection
• Monitor for suspicious activity related to the ShortPixel Image Optimizer plugin

Evidence notes

The vulnerability is described in the CVE record and NVD vulnerability detail page. The CVE Program and NIST National Vulnerability Database provide official information about this vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.