Mar 2026: Microsoft 365 Copilot BizChat Elevation of Privilege Vulnerability
CVE-2026-26137 Published on March 19, 2026
Microsoft 365 Copilot BizChat Elevation of Privilege Vulnerability
Server-side request forgery (ssrf) in Microsoft 365 Copilot's Business Chat allows an authorized attacker to elevate privileges over a network.
Weakness Type
What is a SSRF Vulnerability?
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. By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
CVE-2026-26137 has been classified to as a SSRF vulnerability or weakness.
Products Associated with CVE-2026-26137
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