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Microsoft tracks unauthenticated command injection flaw in mail servers
Original: Unauthenticated command injection on internet-facing mail servers: tracking CVE-2026-73570
Microsoft is tracking CVE-2026-73570, a newly disclosed vulnerability that allows unauthenticated command injection on internet-facing mail servers. Because the flaw can be exploited without credentials and targets exposed systems, security teams are watching for signs of exploitation and awaiting patch guidance. Admins of mail infrastructure are being urged to assess exposure while details and fixes are confirmed.
Why now: A remotely exploitable, unauthenticated flaw in internet-facing mail servers poses immediate risk, driving urgent attention from security teams.
Evidence
- Unauthenticated command injection on internet-facing mail servers: tracking CVE-2026-73570 · Microsoft
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