EUVD-2026-13043CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
3Description
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, 5.3.5 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Analysis
The SlimStat Analytics plugin for WordPress contains a Stored Cross-Site Scripting vulnerability in the 'fh' (fingerprint) parameter that allows unauthenticated attackers to inject malicious scripts into pages. All versions up to and including 5.3.5 are affected due to insufficient input sanitization and output escaping. …
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Remediation
Within 24 hours: Identify all WordPress instances running SlimStat Analytics and document affected versions; disable the plugin if not business-critical or restrict access to trusted users only. Within 7 days: Implement WAF rules to filter malicious payloads in the 'fh' parameter; consider migrating to alternative analytics solutions. …
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