Microsoft 365
Microsoft pauses KB5002907 update after Office license deactivations
Microsoft has paused the rollout of the KB5002907 Microsoft 365 update after users report that it deactivated, or in some cases completely removed, perpetual Office 2016 and Office 2019 installations. KB5002907, titled “Optional update for out-of-date Microsoft 365 Apps installations,” was released to help users update Microsoft 365 Apps installations that are more than 90 days […]
Microsoft to retire Microsoft 365 Companion apps in December
Microsoft announced that it will retire the Calendar, People, and Files Microsoft 365 companion apps on December 16 and urged admins to remove them from managed devices in their organization. This follows Microsoft’s October 2025 announcement that it will begin automatically installing them on all Windows 11 enterprise devices with the Microsoft 365 desktop client […]
BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations
A phishing-as-a-service framework called BigBear 2.0 has been used to bypass multi-factor authentication at 258 organizations and steal more than 5,000 Microsoft 365 credentials. Researchers at cybersecurity company CloudSEK gained administrator access to the control panel and found that the service managed 42 VPS nodes, all configured to target Microsoft 365 as part of the […]
Microsoft confirms outage affecting search in Microsoft 365 apps
Microsoft says some users are experiencing issues searching in Microsoft 365 apps, including Outlook on the web, Outlook desktop, SharePoint Online, and OneDrive. According to an incident report seen by GeekFeed and tracked under MO1456424 in the Microsoft 365 Admin Center, the root cause is what Microsoft describes as a recent deployment that causes resource utilization problems. […]
Hotel Wi-Fi attacks use custom malware to breach Microsoft 365 accounts
Microsoft has linked a global campaign targeting hospitality Wi-Fi networks to the Russian threat actor Midnight Blizzard, also known as APT29. The activity was previously disclosed in a report from cybersecurity company ReliaQuest, which detailed how the attacker changed DNS settings on Wi-Fi devices to steal Microsoft 365 accounts. Besides attributing the campaign to Russian hackers tracked […]
Hackers hijack hotel Wi-Fi DNS to steal Microsoft 365 accounts
Hackers are changing the DNS settings on Wi-Fi devices at hotels and conference centers to redirect users to fake Microsoft 365 login pages. The campaign has been ongoing since at least June and impacts organizations in various sectors, including financial services, professional services, legal, health care, energy, and retail. Cybersecurity company ReliaQuest identified compromised Wi-Fi […]
Microsoft blames massive Microsoft 365 outage on maintenance bug
Microsoft says a bug in its automated network maintenance request system caused Thursday’s massive outage by mistakenly removing IP routes from more devices than intended, disrupting Azure and Microsoft 365 services. The outage began at 10:44 AM ET on Thursday, July 23, and mostly affected customers accessing Microsoft 365 services through network infrastructure connected to […]
Microsoft 365 outage affects Teams, SharePoint and other services
Microsoft is impacted by a massive outage affecting Teams and Microsoft 365 services, primarily affecting users in North America. At 11:11 AM ET on July 23, Downdetector recorded 2,403 reports, sharply above its normal baseline of 29. SharePoint accounted for 78% of the complaints, followed by Excel at 11% and the Microsoft 365 Admin Center at 6% […]
New HollowGraph malware uses Microsoft Graph for stealthy C2 comms
A malicious component dubbed HollowGraph uses the calendar feature in compromised Microsoft 365 mailboxes as a command-and-control channel to receive attacker commands and exfiltrate stolen data. Researchers analysing the module believe it is part of the Cavern command-and-control framework that has been previously linked to an Iranian threat actor targeting entities in Israel. At least 12 systems […]
Microsoft warns of surge in ACR Stealer attacks on customers
Microsoft has observed a surge in attacks using the ACR Stealer malware to steal browser-stored passwords, authentication tokens, and sensitive documents from its enterprise customers. Between late April and mid-June, the threat actor used the ClickFix social-engineering method, WebDAV servers, and the MSHTA (Microsoft HTML Application Host) utility to deliver the info-stealing payload. ACR Stealer […]