September 2026 Microsoft Patch Tuesday, (Tue, Sep 8th)
2026-09-09T01:23:41Z•30b60b15289889e80e441406956468d66f4ecfb0896c6728f77afd32869f5463
AstarothGuildmaMSMQMicrosoft Patch TuesdayMikroTikRRASSSH authentication bypassSkype for Businessactively exploited vulnerabilitymalwarepersistencephishingprivilege escalationremote code executionzero-day
What happened
SANS Internet Storm Center highlights a record-breaking September 2026 Microsoft Patch Tuesday with 973 vulnerabilities, including 113 critical issues and two exploited in the wild. Notable fixes affect Windows privilege escalation, Skype for Business, MSMQ, and RRAS, including critical remote-code-execution flaws. The feed also warns of an actively exploited MikroTik SSH authentication-bypass vulnerability where attackers create persistence accounts, and reports on Guildma/Astaroth malware delivered via Brazilian Portuguese email.
Why it matters
A reviewed impact interpretation has not been published for this record.
Evidence and limitations
- Source ID
- sans_isc_diary
- Record identifier
- 30b60b15289889e80e441406956468d66f4ecfb0896c6728f77afd32869f5463
- Enrichment time
- 2026-09-09T01:23:41Z
- AI-assisted enrichment
- Yes
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