CVE-2026-21260
Analyzed
Analyzed - Analysis Complete
Information Disclosure and Spoofing Vulnerability in Outlook
Publication date: 2026-02-10
Last updated on: 2026-02-11
Assigner: Microsoft Corporation
Description
Description
Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| 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
KEV
| CWE ID | Description |
|---|---|
| CWE-200 | The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
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
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