Medium severity6.1NVD Advisory· Published Sep 8, 2026· Updated Sep 11, 2026
CVE-2026-73319
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.
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Affected products
2Patches
Vulnerability mechanics
References
4- bombobombone.github.io/posts/cve-2026-73319/nvdExploitThird Party Advisory
- www.vulncheck.com/advisories/xenforo-xss-via-dynamic-redirect-handlernvdThird Party Advisory
- xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/nvdRelease Notes
- xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/nvdRelease Notes
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