PHP Object Injection Vulnerability in EWWW Image Optimizer Plugin by WordPress
CVE-2026-91051

Currently unrated

Key Information:

Vendor

WordPress
Status
Ewww Image Optimizer
Vendor
CVE Published:
30 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-91051?

The EWWW Image Optimizer plugin for WordPress, prior to version 8.8.0, allows authenticated users with author-level permissions to insert a serialized value into a post's meta field. Upon rendering, this serialized data is deserialized, which could permit PHP Object Injection. This opens the possibility for remote code execution if a suitable gadget chain exists in the context of an installed, vulnerable version of the EWWW Image Optimizer or another compatible plugin.

Affected Version(s)

EWWW Image Optimizer 8.6.0 < 8.8.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-91051 - Proof of Concept

References

https://wpscan.com/vulnerability/e24a9497-8fb4-4067-8421-...
exploitvdb-entrytechnical-description

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Karthik
WPScan
.