What the vulnerability does
01Description
The SlimStat Analytics plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `fh` (fingerprint) parameter in all versions up to, and including, 5.3.3. This is due to insufficient input sanitization and output escaping on the fingerprint value stored in the database. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever an administrator views the Real-time Access Log report.
Explanation of Vulnerability in Simple Terms
02Summary
SlimStat Analytics versions 5.3.3 and earlier contain a cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts affecting multiple users. The vulnerability requires no authentication or user interaction beyond normal site access. An attacker can inject code that executes in visitors' browsers, potentially stealing session data or redirecting users to malicious sites.
What an attacker can do
03Attacker Capabilities
Inject malicious JavaScript that runs in other users' browsers when they view affected pages.
Potential impact on your site
04Site Impact
Visitors' browsers can be compromised; session tokens or credentials may be stolen; users may be redirected to phishing or malware sites.
Conditions required to exploit
05Prerequisites
Network access to the site; no authentication or user interaction required.
Key dates
06Disclosure timeline
January 9, 2026
CVE published
April 8, 2026
Record updated
