{"id":"CVE-2026-73319","title":"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 by…","summary":"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 by…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-79"],"vendor":"xenforo","product":"xenforo","affected":["xenforo < 2.3.13"],"patched":["xenforo 2.3.13"],"published":"2026-09-08","updated":"2026-09-11","sourceUpdated":"2026-09-11T20:26:33.740","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73319","references":[{"url":"https://bombobombone.github.io/posts/cve-2026-73319/","label":"disclosure@vulncheck.com"},{"url":"https://github.com/BomboBombone/CVE-2026-73319","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/xenforo-xss-via-dynamic-redirect-handler","label":"disclosure@vulncheck.com"},{"url":"https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/","label":"disclosure@vulncheck.com"},{"url":"https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/","label":"disclosure@vulncheck.com"}],"tags":["nvd","exploit-available","cve.org"],"epss":0.00412,"epssPercentile":0.32714,"exploits":{"github":1,"githubRepos":["https://github.com/BomboBombone/CVE-2026-73319"],"checkedAt":"2026-09-25T08:21:11.613Z"},"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-10T13:47:02.889081Z"},"ingestedAt":"2026-09-08T15:33:26.984Z","slug":"CVE-2026-73319","body":"## Overview\n\nXenForo 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.\n\n## Affected\n\n- `xenforo < 2.3.13`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `xenforo 2.3.13`","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":33.6,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":8358,"id":"CVE-2026-73319","ts":1788920417517,"field":"exploit_available","old":"false","new":"true"}]}