Bleepingcomputer Microsoft Investigates Boot Failures in Windows 11 After January 2026 Update
Article Content
Browse articles 
Microsoft is investigating critical boot failure issues affecting Windows 11 devices after the January 2026 security update, specifically the KB5074109 cumulative update. Users have reported encountering 'UNMOUNTABLE_BOOT_VOLUME' errors on devices running Windows 11 versions 25H2 and 24H2, preventing their systems from starting properly.
Ask AI about this cluster
Answers cite the sources they use
Updated 212d ago How this analysis works
More articles in this cluster (2)
Following this threat?
Track Outlook in your own feed — you're alerted when they show up in new reporting, leak sites or exploitation.
Free account · no card needed
Continue Reading
CVE-2015-3306 Exploited in ProFTPD FTP Servers CVE-2015-3306, a vulnerability in ProFTPD 1.3.5, allows remote attackers to read and write arbitrary files using the SITE CPFR and SITE CPTO commands. This exploit can lead to unauthorized access and potential remote code execution, as the commands are executed with the privileges of the ProFTPD service. Active… 
CISA Mandates Urgent Patching of Five Critical Flaws Exploited by Flax Typhoon The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has ordered federal agencies to patch five critical vulnerabilities by October 11, 2026, following exploitation by the China-linked hacking group Flax Typhoon. The vulnerabilities, added to CISA's Known Exploited Vulnerabilities (KEV) catalog, include…