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A Vulnerability in Microsoft Exchange Server Could Allow for Arbitrary Code Execution

📅 15 May 2026 at 19:48 UTC📰 CIS AdvisoriesView original source ↗

A vulnerability has been discovered in Microsoft Exchange Server that could allow for arbitrary code execution. Microsoft Exchange Server is an enterprise-level email and collaboration platform developed by Microsoft that runs on Windows Server. Successful exploitation could allow for arbitrary JavaScript to be executed in the browser context. The malicious code would run with the same permissions as your browser, allowing attackers to steal data, install malware, or hijack your computer.

🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview

A vulnerability in Microsoft Exchange Server allows for arbitrary code execution, potentially leading to data theft, malware installation, or system hijacking. This vulnerability can be exploited through phishing emails sent to users opening them in Outlook Web Access.

⚙️Technical Details
Affected Systems
Microsoft Exchange Server Subscription Edition RTMMicrosoft Exchange Server 2019 Cumulative Update 15Microsoft Exchange Server 2019 Cumulative Update 14Microsoft Exchange Server 2016 Cumulative Update 23
Attack Vectors
PhishingCross-site scripting
💥Impact Assessment
Severity: Large and medium government entities: HIGH
🛡️Recommended Actions
1Apply appropriate mitigations provided by Microsoft to vulnerable systems immediately after testing.
2Establish and maintain a documented vulnerability management process for enterprise assets.
3Perform automated vulnerability scans of internal enterprise assets on a quarterly, or more frequent, basis.
📦Affected Products
Microsoft Exchange Server

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