Is CVE-2026-73319 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-73319?

CVE-2026-73319 has a CVSS v3 severity of MEDIUM (6.1).

Back

CVE-2026-73319

Description

XenForo before 2.3.13 contains a cross-site scripting vulnerability in the dynamic redirect handler that allows unauthenticated attackers to execute arbitrary JavaScript in the board origin by crafting a malicious javascript: URI that bypasses host validation. Attackers can embed the board hostname in the URI authority component and use percent-encoded newlines to evade server-side filters, causing authenticated users who perform a Follow action to execute attacker-supplied JavaScript in their browser.