CVE-2026-65801

Received Received - Intake

Microsoft Exchange Online Server-Side Request Forgery

Publication date: 2026-08-20

Last updated on: 2026-08-20

Assigner: Microsoft Corporation

Description

Server-side request forgery (ssrf) in Microsoft Exchange Online allows an unauthorized attacker to elevate privileges over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-20

Last Modified

2026-08-20

Generated

2026-08-21

AI Q&A

2026-08-21

EPSS Evaluated

N/A

NVD

CVE-2026-65801

EUVD

EUVD-2026-63689

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	exchange_online	*

Helpful Resources

Exploitability

CWE

KEV

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

Executive Summary

This is a server-side request forgery (SSRF) vulnerability in Microsoft Exchange Online. It allows an unauthorized attacker to send crafted requests from the server to other systems over a network, potentially leading to unauthorized actions or privilege escalation.

Impact Analysis

An attacker could exploit this to access internal systems, steal sensitive data, or perform unauthorized actions on behalf of the server. This could lead to data breaches, unauthorized access to user accounts, or further network compromise.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR (data protection) and HIPAA (health information privacy) requirements. Organizations may face legal penalties, fines, or reputational damage due to non-compliance.

Mitigation Strategies

Apply Microsoft Exchange Online security updates immediately. Monitor network traffic for unusual outbound requests to internal or external systems. Restrict unnecessary outbound connections from Exchange servers.

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