CVE-2025-48827: RCE in vBulletin Forums

This vulnerability poses a severe risk to vBulletin installations. An attacker can leverage the /api.php?method=protectedMethod pattern to bypass authentication and directly execute commands on the server. Successful exploitation could lead to complete system compromise, including data exfiltration, malware deployment, and denial of service. The unauthenticated nature of the exploit significantly broadens the attack surface, making it accessible to a wide range of threat actors. Given the popularity of vBulletin, a successful attack could impact numerous organizations and communities.

1. 已保留2025-05-27
2. 发布日期2025-05-27
3. EPSS 更新日期2026-03-23

The primary mitigation is to immediately upgrade vBulletin to version 6.0.4 or later. If upgrading is not immediately feasible, consider implementing temporary workarounds. These may include restricting access to the /api.php endpoint via a Web Application Firewall (WAF) or proxy server, specifically blocking requests with the method=protectedMethod parameter. Review and harden PHP configuration, ensuring proper access controls and disabling unnecessary features. Monitor vBulletin logs for suspicious activity, particularly requests to the /api.php endpoint.