Popup Builder by OptinMonster – WordPress Popups for Optins, Email Newsletters and Lead Generation <= 2.16.1 - Authenticated (Contributor+) Stored Cross-Site Scripting
Strategic Overview
- Status
- Patched in 2.16.2
- Affected Plugin
- Popup Builder & Popup Maker for WordPress – OptinMonster Email Marketing and Lead Generation
- Affected Version
<= 2.16.1- CVSS
- 6.4Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2024-4045
At a glance
CVE-2024-4045 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Popup Builder & Popup Maker for WordPress WordPress plugin, affecting versions <= 2.16.1. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Contributor level or above. The issue is fixed in version 2.16.2; sites on affected versions should update now. Disclosed May 2024, reported by wesley (wcraft).
Vulnerability Overview
The Popup Builder by OptinMonster – WordPress Popups for Optins, Email Newsletters and Lead Generation plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘campaign_id’ parameter in versions up to, and including, 2.16.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Popup Builder & Popup Maker for WordPress <= 2.16.1 carries this weakness at campaign_id, and reaching it takes an account at Contributor level or above. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Popup Builder & Popup Maker for WordPress the fix is 2.16.2: builds <= 2.16.1 are affected, anything from 2.16.2 onward is not.
Remediation
Update to version 2.16.2, or a newer patched version
How does WordSec protect against this?
An attacker needs Contributor access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Popup Builder & Popup Maker for WordPress 2.16.2 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Popup Builder & Popup Maker for WordPress – OptinMonster Email Marketing and Lead Generation
- 8.2CVE-2021-39341: OptinMonster <= 2.6.4 Unprotected REST-API Endpoints
CVE-2021-39341 - 5.3CVE-2016-10996: Popup Builder by OptinMonster <= 1.1.4.5 RCE
CVE-2016-10996 - 4.3CVE-2024-33691: Popup Builder by OptinMonster CSRF to Notice Dismissal
CVE-2024-33691 - 4.3CVE-2023-0772: OptinMonster <= 2.12.1 Sensitive Information Disclosure
CVE-2023-0772
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