# Wordpress Alert: PHP object injection through unsafe deserialization

A plugin unserializes untrusted input into PHP objects. Available object behaviors may be abused, sometimes with severe consequences.

2026-07-30
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Switchboard Tech Services


![Wordpress Alert: PHP object injection through unsafe deserialization](https://switchboardtechservices.com/static/images/defaults/guides.webp)

## What it looks like

A plugin unserializes untrusted input into PHP objects.

## Why it matters

Available object behaviors may be abused, sometimes with severe consequences.

## What to check

Audit deserialization of request, cookie, and imported data.

## Documentation

This is an exploit pattern to check in installed components, not a claim that every WordPress site has this flaw. Confirm the product and version against its advisories before treating a site as affected. See [OWASP deserialization guidance](https://cheatsheetseries.owasp.org/cheatsheets/Deserialization_Cheat_Sheet.html).

- Categories:
  [WordPress](https://switchboardtechservices.com/guides/categories/wordpress/)
- Tags:
  [#WordPress Security](https://switchboardtechservices.com/guides/tags/wordpress-security/), [#Injection](https://switchboardtechservices.com/guides/tags/injection/)

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Canonical URL: https://switchboardtechservices.com/guides/wordpress-alert-php-object-injection-through-unsafe-deserialization/

Language: en-us

Content type: guide

Author: Switchboard Tech Services

Published: 2026-07-30T11:06:11+00:00

Description: A WordPress security alert about php object injection through unsafe deserialization: signs, impact, and what to check.