A major security flaw just hit the long-running forum platform vBulletin. Researchers disclosed CVE-2026-61511, a remote code execution (RCE) vulnerability rated 9.3 (CVSS 4.0). The scary part? Attackers can trigger malicious requests from public pages without logging in, then reach server-side PHP code execution. This isn’t “just” defacing posts. Successful exploitation could grant attackers real program execution on the server—opening the door to data theft, full site takeover, or manipulation of the underlying system. Actual damage depends on what permissions the application has in its environment. The root cause traces back to vBulletin’s template system and specific “math operations” logic. Even if input filtering is intended to block dangerous expressions, researchers found gaps in how encoding can bypass those rules. They also identified an alternate attack path that doesn’t rely on an authenticated session—leveraging page navigation-related features to funnel payloads into expression handling. PoC by security researcher Egidio Romano is published, making testing and evaluation easier for defenders—and easier for attackers too. Affected versions include 5.0.0–5.7.5 and 6.0.0–6.2.1. vBulletin 6.2.2 fixes it. #CyberSecurity #RCE #vBulletin #Vulnerability #PatchManagement #BugBounty
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