Public exploit details published on July 27 describe CVE-2026-61511, an unauthenticated remote code execution flaw in vBulletin’s template engine that can reach PHP’s eval() and execute commands on unpatched forum servers. Although vBulletin had already patched affected self-hosted branches and released vBulletin 6.2.2 weeks earlier, defenders are still urged to monitor suspicious ajax/render/pagenav requests and update any exposed installations. #vBulletin #CVE-2026-61511 #EgiX
Keypoints
- CVE-2026-61511 enables unauthenticated remote code execution in vBulletin.
- The flaw resides in /includes/vb5/template/runtime.php within vB5_Template_Runtime::runMaths().
- A public route, ajax/render/pagenav, can pass attacker input into the vulnerable math handler.
- The exploit rebuilds PHP function names with restricted characters and can invoke system().
- vBulletin 6.2.2 and the related branch patches were released before public disclosure.
Read More: https://thehackernews.com/2026/07/public-exploit-released-for-patched.html