CVE-2026-73319

Medium

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.

SeverityMedium

CVSS6.1

Exploit probability—

Product

Xenforo

PublishedSep 8, 2026

First seenSep 8, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

xenforo xenforo2.3.13 or later

Patches

xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/

Vendor advisories

xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/

Affected products

Product	Affected versions	Fixed in
xenforo xenforo	v < 2.3.13	2.3.13

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