CVE-2026-21527
Analyzed Analyzed - Analysis Complete
UI Spoofing Vulnerability in Microsoft Exchange Server

Publication date: 2026-02-10

Last updated on: 2026-06-15

Assigner: Microsoft Corporation

Description
User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-02-10
Last Modified
2026-06-15
Generated
2026-06-16
AI Q&A
2026-02-10
EPSS Evaluated
2026-06-15
NVD
CVE-2026-21527
EUVD
EUVD-2026-7340
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
microsoft exchange_server 2016
microsoft exchange_server 2019
microsoft exchange_server 2019
microsoft exchange_server_subscription_edition to 15.02.2562.037 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-451 The user interface (UI) does not properly represent critical information to the user, allowing the information - or its source - to be obscured or spoofed. This is often a component in phishing attacks.
CWE-345 The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.
CWE-1286 The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability is a user interface misrepresentation issue in Microsoft Exchange Server. It allows an unauthorized attacker to perform spoofing over a network by misleading users with incorrect or deceptive information displayed in the user interface.

Impact Analysis

The vulnerability can impact you by enabling an attacker to spoof critical information, potentially leading to unauthorized actions or decisions based on false data. This can compromise the integrity and trustworthiness of communications or operations within Microsoft Exchange Server.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

I don't know

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-21527. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart