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Zero Days

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Microsoft's September 2026 Patch Tuesday fixes record 966 flaws, two exploited zero-days

Microsoft's latest Patch Tuesday update addresses 966 vulnerabilities, the largest batch it has ever released in a single month, including 105 critical-rated bugs. Two of the flaws are zero-days already being actively exploited by attackers. This follows 570 fixes in August and 400 the month before, showing a sharp month-over-month escalation.

Attackers exploit patched PaperCut flaws to steal data from print servers

Hackers are actively exploiting two recently disclosed PaperCut NG and MF vulnerabilities, CVE-2026-81578 and CVE-2026-82078, to bypass authentication and steal data from print management servers. PaperCut issued emergency fixes last week, but researchers at Defused say attackers are using the bypass to hijack the software's user-lookup function and dump database tables rather than pursue remote code execution as earlier reports suggested. Over 800 PaperCut servers remain exposed online according to Shadowserver, and PaperCut has not yet attributed the attacks or detailed post-compromise activity.