WP Fusion Lite <= 3.37.18 – Reflected Cross-Site Scripting
Strategic Overview
- Status
- Patched in 3.37.30
- Affected Version
<= 3.37.18- CVSS
- 6.1Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2021-34660
At a glance
CVE-2021-34660 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the WP Fusion Lite WordPress plugin, affecting versions <= 3.37.18. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 3.37.30; sites on affected versions should update now. Disclosed August 2021, reported by Xu-Liang Liao.
Vulnerability Overview
The WP Fusion Lite WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the startdate parameter found in the ~/includes/admin/logging/class-log-table-list.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 3.37.18.
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 privileges on the target site.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in WP Fusion Lite <= 3.37.18 takes a caller who can reach the endpoint. 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 WP Fusion Lite the fix is 3.37.30: builds <= 3.37.18 are affected, anything from 3.37.30 onward is not.
Remediation
Update to version 3.37.30, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to WP Fusion Lite: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: WP Fusion Lite 3.37.30 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Other vulnerabilities in WP Fusion Lite – Marketing Automation and CRM Integration for WordPress
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