---
id: "CVE-2026-54857"
kind: "vulnerability"
aliases: ["CVE-2026-54857"]
title: "Quirky WordPress plugin: unauthenticated PHP object injection up to 1.23"
severity: "critical"
cvss: 9.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "php", "quirky", "wordpress"]
not_affected_if: ["plugin-not-installed"]
published_at: "2026-10-29T16:18:09+00:00"
first_seen_at: "2026-10-29T16:25:59+00:00"
updated_at: "2026-10-29T16:27:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54857", "first_seen_at": "2026-10-29T16:25:59+00:00"}]
---

# Quirky WordPress plugin: unauthenticated PHP object injection up to 1.23

Quirky versions 1.23 and older accept untrusted input that gets unserialized as a PHP object. An unauthenticated attacker can use this to inject objects, which can lead to code execution on the server.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Quirky plugin version in the WordPress admin plugin list, or in the plugin's main file header.

## Fix

- Move Quirky past `1.23`; the sources do not name the fixed version.

## Timeline

- 2026-10-29T16:25:59+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-54857

## From the sources

Unauthenticated PHP Object Injection in Quirky <= 1.23 versions.

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