CVE-2024-9428: Popup Builder < 4.3.5 - Admin+ Stored XSS

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-12-12 · updated 2026-06-17
Weakness: CWE-79

Description

The Popup Builder WordPress plugin before 4.3.5 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).

Affected products

Popup Builder: before 4.3.5 — fixed in 4.3.5

How to fix

Upgrade to a fixed version: Popup Builder 4.3.5. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/6e246547-e509-48db-88ae-b2f943398377/
https://wpscan.com/vulnerability/6e246547-e509-48db-88ae-b2f943398377/

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