CVE-2026-26137
Server-Side Request Forgery in Microsoft 365 Copilot Business Chat Enables Privilege Escalation
Publication date: 2026-03-19
Last updated on: 2026-03-27
Assigner: Microsoft Corporation
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | 365_copilot_chat | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-918 | The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
[{'type': 'paragraph', 'content': "This vulnerability is a server-side request forgery (SSRF) issue found in Microsoft 365 Copilot's Business Chat. It allows an authorized attacker to send crafted requests from the server, which can lead to elevated privileges over a network."}] [1]
How can this vulnerability impact me? :
The impact of this vulnerability is an elevation of privilege, meaning an attacker who is already authorized can gain higher-level access than intended. This can lead to critical consequences such as unauthorized access to sensitive data or systems within the network.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know