WAF Protection for vBulletin RCE and Detection Improvements

This release introduces new protection for a remote code execution vulnerability in vBulletin and improves two existing detections.

Key Findings

• A new detection provides protection against vBulletin CVE-2026-61511.
• Two existing detections have been improved to strengthen coverage.

Impact

Successful exploitation of CVE-2026-61511 may lead to remote code execution on affected vBulletin systems, potentially resulting in unauthorized access, data exposure, service disruption, and broader compromise of the hosting environment. Administrators are strongly encouraged to apply vendor updates and recommended mitigations.

Ruleset	Rule ID	Legacy Rule ID	Description	Previous Action	New Action	Comments
Cloudflare Managed Ruleset	...94f3006b	N/A	vBulletin - Remote Code Execution - CVE:CVE-2026-61511	Log	Block	This is a new detection.
Cloudflare Managed Ruleset	...098b749e	N/A	Version Control - Information Disclosure - Beta	Log	Block	This rule is merged into the original rule "Version Control - Information Disclosure" (ID: ...0550c529)
Cloudflare Managed Ruleset	...d56225d8	N/A	vBulletin - Code Injection - Invalid image format - CVE:CVE-2019-17132 - Beta	Log	Block	This rule is merged into the original rule "vBulletin - Code Injection - Invalid image format - CVE:CVE-2019-17132" (ID: ...8fe9f1c7)