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Microsoft released updates addressing 1,093 security flaws across Windows and supported software, 63 of them rated critical. One flaw, CVE-2026-124194, a spoofing bug affecting Outlook and Microsoft 365 Apps, is already being actively exploited. The release brings Microsoft's total patches issued this year to over 5,100, alongside security updates this week from Apple, Adobe, Google and Mozilla.
Arista Networks has issued security updates for a critical zero-day, CVE-2026-114625, affecting on-premises VeloCloud Orchestrator deployments. The flaw lets authenticated users with basic privileges exploit a low-complexity SQL injection to escalate to 'superuser operator' access without user interaction, and Arista says it has already patched its own hosted VCO instances on versions 5.2.3.18+, 6.1.3.10+, and 6.4.2.12+.
Palo Alto Networks disclosed a high-severity PAN-OS flaw, rated 8.6, that lets authenticated attackers with management-interface access execute code as root. The company said it observed limited exploitation in the wild and has released patches for PAN-OS 10.2, 11.1, 11.2, 12.1 and 12.2, with a fix for 11.2.16 due October 15. The flaw affects PA-Series and VM-Series firewalls and Panorama appliances, but not Cloud NGFW or Prisma Access.
CISA is directing admins to immediately patch CVE-2026-104935, a high-severity authentication bypass in Ivanti Connect Secure that has been exploited as a zero-day since at least October 1. Ivanti released patched versions on Tuesday, and researchers at Volexity and Defused say an unknown threat actor chained the bug with two other flaws to gain unauthenticated root access and steal Active Directory credentials, LAPS passwords and BitLocker keys.
Citrix has released emergency firmware updates for NetScaler ADC and Gateway appliances to fix CVE-2026-88779, a memory buffer vulnerability in SAML authentication with a CVSS score of 8.7. The company confirmed the bug has already been exploited in targeted attacks against unpatched devices, causing denial-of-service outages, and said it has found no evidence of customer data being compromised. Fixed versions include 14.1-73.41 and 13.1-64.28, with separate builds for FIPS and NDcPP customers.
Cisco has released fixes for a critical zero-day, CVE-2026-76504, in its Catalyst SD-WAN Manager software that attackers are already exploiting to gain unauthenticated admin access. The flaw stems from improper URI encoding handling that lets crafted HTTP requests bypass authentication on a specific API endpoint. Cisco says it learned of active exploitation in September 2026 and is urging customers to upgrade immediately.
Bitget disclosed that attackers who stole $387.5 million from its hot and warm wallets last week gained access by exploiting zero-day vulnerabilities in two third-party security appliances. Investigations by SlowMist and Mandiant found the attackers planted a web shell and malware, moved laterally to Bitget's production wallet job server, and used a custom withdrawal tool to execute transfers over roughly three hours starting September 24-25. Bitget had suspended withdrawals after detecting the unauthorized transfers.
Mandiant and other security firms say attackers began exploiting an unpatched Citrix NetScaler flaw, tracked as CVE-2026-88772, in early September to install custom web shells and tunneling malware, gain root access, steal credentials, and move into internal networks. Victims span government, financial services, education, legal, and professional services organizations in North America and Europe. Citrix disclosed two related zero-days, CVE-2026-88771 and CVE-2026-88772, on Sunday and released patches after researchers including GreyNoise and watchTowr flagged active exploitation.
Check Point Software has issued emergency hotfixes for CVE-2026-93616, a critical path traversal vulnerability in its Security Management Server that lets unauthenticated attackers upload and run arbitrary scripts. The company confirmed the flaw is being actively exploited, with a handful of customers already compromised, and released a fix in R82.20 Security Hotfix covering Security Management Server, Multi-Domain Security Management Server, Log Server, Multi-Domain Log Server, and SmartEvent.
Security researcher Abdelhamid Naceri published a new proof-of-concept exploit called BigDiskBuster that, when run in the background, prevents Microsoft Defender from installing platform or signature updates on any supported Windows version. Naceri describes it as similar to his earlier UnDefend exploit, and says the code is still buggy but demonstrates the concept clearly. This is the latest in a string of nearly a dozen Defender and Windows-related exploits he has released since April 2026 amid an ongoing dispute with Microsoft over his termination.
Security researcher Nightmare-Eclipse has published a new proof-of-concept exploit called ShieldCrash on GitHub, claiming it circumvents Microsoft's fix for CVE-2026-69414 (ShieldBreak), a privilege escalation bug in the Malware Protection Engine. The exploit reportedly allows arbitrary file reads as SYSTEM on all supported Windows versions, despite Microsoft's September patch. Microsoft has not yet responded to requests for comment on the claim.
A researcher using the alias Nightmare Eclipse publicly released details of a new zero-day exploit dubbed 'ShieldCrash' targeting Microsoft Defender, timed to appear right after Microsoft's September 2026 Patch Tuesday updates. The exploit reportedly allows attackers to gain SYSTEM-level access on affected Windows machines, the highest level of privilege on the system.