Last Updated: May 29, 2024
ISSUE
When you click to open an .ICS file you are prompted with the following warning:
“Microsoft Office has identified a potential security concern.
This location may be unsafe.”
This issue happens after installing the Outlook Desktop December 12th security updates. For additional information see the respective CVEs. CVE-2023-35636 - Security Update Guide - Microsoft - Microsoft Outlook Information Disclosure Vulnerability
STATUS: WORKAROUND
The Outlook Team found issues with the fix while it was being tested in the Insider channels and the fix was pulled back. An updated fix is currently planned to release in the July 9th public updates for Outlook Desktop.
In the meantime, if you need to temporarily disable the security notice you can use the registry key below. If you decide to use the registry key, please be aware it will stop security notice prompts for all types of files and not just for the .ICS files.
If you need to disable this dialog, follow the instructions in the article Enable or disable hyperlink warning messages in Office programs.
Group Policy registry path:
HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\common\security
DWORD: DisableHyperlinkWarning
Value: 1
OCT registry path:
Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Security
DWORD: DisableHyperlinkWarning
Value: 1
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