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Zimbra zero-day exposes mail servers to attack

Neowin reports that an unauthenticated command-injection flaw in Zimbra's SNMP notification path can let attackers steal session tokens and install persistent webshells on mail servers.

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2 Sources, 12h ago, first seen 12h ago

TLDR

Neowin reports, citing a Microsoft warning, that a Zimbra zero-day exposes mail servers to attack. It says unauthenticated command injection through the SNMP notification path can let attackers steal session tokens and install persistent webshells.

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2 Sources, first seen 12h ago

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Combined views

6.8K

2 Sources, first seen 12h ago

2 likes3 comments

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2 Sources

@NeowinFeedUnauthenticated command injection in the SNMP notification path lets hackers steal session tokens and install persistent webshells on mail servers. #Zimbra #CollaborationSuite https://www.neowin.net/news/zimbra-zero-day-exploit-exposes-mail-servers-to-attack-microsoft-warns/
@arstechnicaAttackers have been exploiting critical Zimbra flaw to steal emails https://arstechnica.com/security/2026/09/attackers-have-been-exploiting-critical-zimbra-flaw-to-steal-emails/?utm_campaign=dhtwitter&utm_content=%3Cmedia_url%3E&utm_medium=social&utm_source=twitter
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    2 Sources

    @NeowinFeedUnauthenticated command injection in the SNMP notification path lets hackers steal session tokens and install persistent webshells on mail servers. #Zimbra #CollaborationSuite https://www.neowin.net/news/zimbra-zero-day-exploit-exposes-mail-servers-to-attack-microsoft-warns/
    @arstechnicaAttackers have been exploiting critical Zimbra flaw to steal emails https://arstechnica.com/security/2026/09/attackers-have-been-exploiting-critical-zimbra-flaw-to-steal-emails/?utm_campaign=dhtwitter&utm_content=%3Cmedia_url%3E&utm_medium=social&utm_source=twitter
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