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Critical Outlook vulnerability discovered (February 2024)

Security researchers discover vulnerability in Microsoft Outlook

In February 2024, security researchers discovered a vulnerability in Microsoft Outlook and classified it as critical. You can read everything you need to know as a user here.

Outlook vulnerability: What you should know about CVE-2024-21413

Checkpoint Research, an American-Israeli IT security company, discovered the current Outlook vulnerability and presented it on February 14. Microsoft had already recognized this the day before. The official name for the vulnerability in the e-mail software is CVE-2024-21413.

In the event of an attack, the hacker can bypass the protected mode in the Office view and open emails in edit mode instead. If an attacker exploits this vulnerability in Outlook, they can unlock various privileges, such as rights to read, write and delete emails. All he has to do is create a link to bypass the Protected View protocol.


Microsoft security – How to protect yourself from the vulnerability in Outlook

The good news: As a Microsoft Outlook user, you can protect yourself quickly and easily against the security vulnerability. Microsoft recommends that all users of Office 2016, 2019, 2021 and Office 365 install the latest updates listed in the support article on CVE-2024-21413.

You can find the official Microsoft support article here:



Outlook security vulnerability

How should the vulnerability in Microsoft Outlook be assessed?

Servers with Microsoft Exchange are attractive targets for cyber criminals, as they represent central account points in the communication of many companies. Data theft, sabotage and the sending of illegitimate e-mails are the result. If the servers are paralyzed, this in turn leads to severe disruptions to operational processes. Cyber attacks on Microsoft Exchange and Outlook have repeatedly caused considerable damage to companies in the past.

In addition to regular Outlook software updates, an email security solution that protects against attacks is particularly recommended for companies. Malicious emails can thus be blocked before they infiltrate your inbox. You can find out more about email security for companies in our factsheet.


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