CVE-2026-21260
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Information Disclosure and Spoofing Vulnerability in Outlook

Publication date: 2026-02-10

Last updated on: 2026-02-11

Assigner: Microsoft Corporation

Description
Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
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Meta Information
Published
2026-02-10
Last Modified
2026-02-11
Generated
2026-06-16
AI Q&A
2026-02-10
EPSS Evaluated
2026-06-15
NVD
CVE-2026-21260
EUVD
EUVD-2026-7354
Affected Vendors & Products
Showing 13 associated CPEs
Vendor Product Version / Range
microsoft sharepoint_server 2019
microsoft sharepoint_server 2016
microsoft 365_apps *
microsoft 365_apps *
microsoft office 2019
microsoft office 2019
microsoft outlook 2016
microsoft outlook 2016
microsoft office_long_term_servicing_channel 2021
microsoft office_long_term_servicing_channel 2021
microsoft office_long_term_servicing_channel 2024
microsoft office_long_term_servicing_channel 2024
microsoft sharepoint_server to 16.0.19127.20518 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
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Executive Summary

This vulnerability involves the exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook. It allows an unauthorized attacker to perform spoofing over a network.

Impact Analysis

The vulnerability can impact you by enabling an attacker to spoof communications, potentially misleading you or others by impersonating trusted entities. This could lead to unauthorized access to sensitive information or deception in communications.

Compliance Impact

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Detection Guidance

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Mitigation Strategies

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