Popup Builder <= 3.63 - Unauthenticated Stored Cross-Site Scripting
An XSS vulnerability in the popup-builder plugin before 3.64.1 for WordPress allows remote attackers to inject arbitrary JavaScript into existing popups via an unsecured ajax action in com/classes/Ajax.php. It is possible for an unauthenticated attacker to insert malicious JavaScript in several of the popup's fields by sending a request to wp-admin/admin-ajax.php with the POST action parameter of sgpb_autosave and including additional data in an allPopupData parameter, including the popup's ID (which is visible in the source of the page in which the popup is inserted) and arbitrary JavaScript which will then be executed in the browsers of visitors to that page. Because the plugin functionality automatically adds script tags to data entered into these fields, this injection will typically bypass most WAF applications.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Popup Builder – Create highly converting, mobile friendly marketing popups. | <= 3.63 | 3.64.1 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L- Weakness (CWE)
CWE-79- Platform
- WordPress
- Package
Popup Builder – Create highly converting, mobile friendly marketing popups.- Disclosed
- 12.03.2020
- Updated
- 11.10.2026 10:22
Sources and licenses
Wordfence Intelligence - 0d8a8aa7-8344-4ca7-8194-9bc679d18661 - Wordfence Intelligence
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Copyright 2012-2026 Defiant Inc.
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Vulnerability history: Popup Builder – Create highly converting, mobile friendly marketing popups.
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 23
- First → latest
- 08.2019 02.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 6
- Medium 14
Disclosures per year
- 2019: 1
- 2020: 3
- 2021: 2
- 2022: 6
- 2023: 2
- 2024: 7
- 2025: 1
- 2026: 1
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Popup Builder <= 3.63 - Unauthenticated Stored Cross-Site Scripting this entry
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