WAF – WAF Release – 2026-03-02

This week’s release introduces new detections for vulnerabilities in SmarterTools SmarterMail (CVE-2025-52691 and CVE-2026-23760), alongside improvements to an existing Command Injection (nslookup) detection to enhance coverage.

Key Findings

• CVE-2025-52691: SmarterTools SmarterMail mail server is vulnerable to Arbitrary File Upload, allowing an unauthenticated attacker to upload files to any location on the mail server, potentially enabling remote code execution.
• CVE-2026-23760: SmarterTools SmarterMail versions prior to build 9511 contain an authentication bypass vulnerability in the password reset API permitting unaunthenticated to reset system administrator accounts failing to verify existing password or reset token.

Impact

Successful exploitation of these SmarterMail vulnerabilities could lead to full system compromise or unauthorized administrative access to mail servers. Administrators are strongly encouraged to apply vendor patches without delay.

Ruleset	Rule ID	Legacy Rule ID	Description	Previous Action	New Action	Comments
Cloudflare Managed Ruleset	0f282f3c89614779966faf52966ec6b1	N/A	SmarterMail – Arbitrary File Upload – CVE-2025-52691	Log	Block	This is a new detection.
Cloudflare Managed Ruleset	35978af68e374a059e397bf5ee964a8c	N/A	SmarterMail – Authentication Bypass – CVE-2026-23760	Log	Block	This is a new detection.
Cloudflare Managed Ruleset	4bb099bcd71141d4a35c1aa675b64d99	N/A	Command Injection – Nslookup – Beta	Log	Block	This rule is merged into the original rule “Command Injection – Nslookup” (ID: f4a310393c564d50bd585601b090ba9a )

Source: Cloudflare

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