WAF Release - New Rules & Enhanced Cloud Protection

This release introduces new rules and updates Microsoft SharePoint RCE alongside enhanced SSRF cloud protection rule actions.

Key Findings

• CVE-2026-50522: An insecure deserialization vulnerability in Microsoft SharePoint Server. This may allow an unauthenticated attacker to execute arbitrary code using crafted requests.
• CVE-2026-66066: An improper input processing vulnerability in Ruby on Rails Active Storage image variant transformations. This may allow an unauthenticated attacker to perform arbitrary file reads and achieve Remote Code Execution (RCE) using maliciously crafted payload requests.
• Generic Cloud Protections: Added improved detection logic targeting Server-Side Request Forgery (SSRF) in cloud-hosted applications.

Ruleset	Rule ID	Legacy Rule ID	Description	Previous Action	New Action	Comments
Cloudflare Managed Ruleset	...052b07cf	N/A	Microsoft SharePoint - Remote Code Execution - CVE:CVE-2026-50522	Log	Block	This is a new detection.
Cloudflare Managed Ruleset	...3a5b40d6	N/A	Rails - Arbitrary File Read & RCE - CVE:CVE-2026-66066	Block	Block	This was labeled as File Upload - RCE.
Cloudflare Managed Ruleset	...8242627b	N/A	SSRF - Local	Disabled	-	This detection has been removed.
Cloudflare Managed Ruleset	...743a63ec	N/A	SSRF - Local - 2 - Beta	Disabled	-	This detection has been removed.
Cloudflare Managed Ruleset	...c2e84e2d	N/A	SSRF - Cloud - Beta	Disabled	-	This detection has been removed.
Cloudflare Managed Ruleset	...ab8af26f	N/A	SSRF - Cloud - 2 - Beta	Disabled	-	This detection has been removed.
Cloudflare Managed Ruleset	...25ba9d7c	N/A	SSRF - Cloud	Disabled	Block	We are changing the action for this rule from Disabled to BLOCK
Cloudflare Managed Ruleset	...01a076eb	N/A	SSRF - Local - Beta	Disabled	-	This detection has been removed.