GHSA-vv8x-44ww-j3whHighCVSS 6.5
XenForo before 2.3.13 contains an uncontrolled recursion vulnerability in the BBCode parser that...
🔗 CVE IDs covered (1)
📋 Description
XenForo before 2.3.13 contains an uncontrolled recursion vulnerability in the BBCode parser that allows authenticated attackers to cause persistent denial of service by submitting a post with deeply nested BBCode tags. Attackers can craft a single malicious post with sufficient nesting depth to exceed PHP's stack limit, causing fatal errors that repeatedly terminate PHP-FPM workers for all visitors rendering the affected thread.
🔗 References (7)
- https://nvd.nist.gov/vuln/detail/CVE-2026-73321
- https://www.vulncheck.com/advisories/xenforo-uncontrolled-recursion-dos-via-bbcode-parser
- https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856
- https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857
- https://bombobombone.github.io/posts/cve-2026-73321
- https://github.com/BomboBombone/CVE-2026-73321
- https://github.com/advisories/GHSA-vv8x-44ww-j3wh