January 24, 2026—KB5078133 (OS Build 25398.2097) Out-of-band

January 24, 2026—KB5078133 OS Build 25398.2097 Out-of-band ​​​​This out-of-band update for Windows Server 23H2 KB5078133 is cumulative. It includes updates from previous security, along with an additional fix. To learn more about differences between security updates, optional non-security preview...

Security Bulletin: Possibility for Accidental Disclosure of Microsoft Exchange Mailboxes to Unauthorized Users (CVE-2013-3976)

Abstract Due to a problem in the Data Protection for Exchange and FlashCopy Manager for Exchange components, once a mailbox is restored into a .PST file, each individual .PST file will be created as expected, but the contents of that .PST file may not be the contents associated with that mailbox...

CVE-2021-40836

A vulnerability affecting F-Secure antivirus engine was discovered whereby scanning MS outlook .pst files can lead to denial-of-service. The vulnerability can be exploited remotely by an attacker. A successful attack will result in denial-of-service of the antivirus engine...

CVE-2021-40836

The CVE-2021-40836 entry describes a DoS in the F-Secure antivirus engine when scanning MS Outlook .pst files. Vulnerability can be exploited remotely, leading to availability impact (partial) of the antivirus engine. Connected sources confirm the affected product (F-Secure antivirus engine) and ...