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News > Attacks & Threats > On-Prem Microsoft Exchange Server CVE-2026-42897 Exploited via Crafted Email

On-Prem Microsoft Exchange Server CVE-2026-42897 Exploited via Crafted Email

Microsoft has disclosed a new security vulnerability impacting on-premise versions of Exchange Server that it said has come under active exploitation in the wild.

The vulnerability, tracked as CVE-2026-42897 (CVSS score: 8.1), has been described as a spoofing bug stemming from a cross-site scripting flaw. An anonymous researcher has been credited with discovering and reporting the issue.

"Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network," the tech giant said in a Thursday advisory.

Microsoft, which tagged the vulnerability with an "Exploitation Detected" assessment, said an attacker could weaponize it by sending a crafted email to a user, which, when opened in Outlook Web Access and subject to other "certain interaction conditions," can allow arbitrary JavaScript code to be executed in the context of the web browser. More here

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Microsoft has disclosed a new security vulnerability impacting on-premise versions of Exchange Server that it said has come under active exploitation in the wild. More...

A Nitrogen ransomware attack on Foxconn's North American facilities is one of 600 hits on manufacturers this year, as ga… More...

Malicious repositories can trigger code execution in Claude Code, Cursor CLI, Gemini CLI, and CoPilot CLI with minimal o… More...

Cyber adversaries have long used AI, but now attackers are using large language models to develop exploits and orchestra… More...

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