Security News

Hewlett Packard Enterprise (HPE) is notifying employees whose data was stolen from the company's Office 365 email environment by Russian state-sponsored hackers in a May 2023 cyberattack. [...]

​Microsoft has fixed a known issue that caused Microsoft 365 applications and Classic Outlook to crash on Windows Server 2016 or Windows Server 2019 systems. [...]

​Microsoft has rolled out a fix for a known issue that causes random "Product Deactivated" errors for customers using Microsoft 365 Office apps. [...]

Toyota Tsusho Insurance Broker India, an Indo-Japanese joint insurance venture, operated a misconfigured server that exposed more than 650,000 Microsoft-hosted email messages to customers, a security researcher has found. Zveare then examined the calculator web page on the TTIBI website and saw that it included a client-side function that created a request to send email using a server-side API. "This caught my eye because this was a client-side email sending mechanism," he wrote in a post describing his findings.

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) and the Federal Bureau of Investigation (FBI) warned that threat actors deploying the AndroxGh0st malware are creating a botnet for...

British outsourcing services provider Capita announced today that a cyberattack on Friday prevented access to its internal Microsoft Office 365 applications. The cyber incident prompted the Capita on March 31 to announce an IT issue that impacted its internal systems.

New research has disclosed what's being called a security vulnerability in Microsoft 365 that could be exploited to infer message contents due to the use of a broken cryptographic algorithm. Office 365 Message Encryption is a security mechanism used to send and receive encrypted email messages between users inside and outside an organization without revealing anything about the communications themselves.

Microsoft Office 365 Message Encryption claims to offer a way "To send and receive encrypted email messages between people inside and outside your organization." Office 365 Message Encryption relies on a strong cipher, AES, but WithSecure says that's irrelevant because ECB is weak and vulnerable to cryptanalysis regardless of the cipher used.

We're not quite sure what to call it right now, so we referred to it in the headline by the hybrid name Microsoft Office 365. The web-based versions of the Office tools don't have the same feature set as the full apps, so any results we might obtain are unlikely to align with how most business users of Office, ah, 365 have configured Word, Excel, Outlook and friends on their Windows laptops.

WithSecure researchers are warning organizations of a security weakness in Microsoft Office 365 Message Encryption that could be exploited by attackers to obtain sensitive information. OME, which is used by organizations to send encrypted emails internally and externally, utilizes the Electronic Codebook implementation - a mode of operation known to leak certain structural information about messages.