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Pi-hole 5.0, 5.1, and 5.1.1 allows XSS via the Options header to the admin/ URI. A remote user is able to inject arbitrary web script or HTML due to incorrect sanitization of user-supplied data and achieve a Reflected Cross-Site Scripting attack against other users and steal the session cookie.
Use CWE-79, Pi-Hole vendor hub and Pi-Hole product page to widen CVE-2020-35592 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2025-34087, CVE-2024-34361 and CVE-2024-28247 for nearby disclosures in the same product family.