Live › vulnerability › CVE-2026-50522
Go to dashboardMicrosoft SharePoint has a deserialization of untrusted data flaw that lets an unauthenticated attacker over the network run code on the server. CISA lists it as actively exploited in the wild.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Microsoft SharePoint | vendor | – | – |
| microsoft sharepoint server | vendor | < 16.0.19725.20434 | 16.0.19725.20434 |
| microsoft sharepoint server | vendor | = 2016 | – |
| microsoft sharepoint server | vendor | = 2019 | – |
Unknown from the sources.
What vendors did on their customers’ behalf. Holds only for traffic through them; patching is still the fix.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
WAF Release - 2026-08-04 · Changelog
New updates and improvements at Cloudflare.
August 4, 2026
This release introduces new rules and updates Microsoft SharePoint RCE alongside enhanced SSRF cloud protection rule actions.
Key Findings
| 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 | ...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. |
This page as .md · .json · in your agent: get_signal("CVE-2026-50522")
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