# Critical Zimbra RCE flaw now actively exploited in attacks

> **Newsylist Open Intelligence Dossier** · First detected: 2026-08-21 09:29 UTC · Category: Technology · Sources: 6 · Current Velocity: 4.29

## Multi-Source Evidence Table
| Source Outlet | Headline | Published (UTC) | Verification URL |
|---|---|---|---|
| cyberpress.org | Critical Zimbra OS Command Injection Vulnerability Exploited in the Wild | 2026-08-20 09:46 | [Source Link](https://news.google.com/rss/articles/CBMif0FVX3lxTE9NWkRWRzFWOTJySTAyU3BkSXZvMmVDNzdjTmxCOGxsY2Q0OWlZT1lhZ1EzRHVFSnBwTDN4YkFMOTdRQmloRWJ4RU5POW5YUWVIN3dWNEhqWGdoX01relp6UWM3aDJTanl2MlhKVFIwTDBWWUl4RF9BdlZhNUthejDSAX9BVV95cUxPTVpEVkcxVjkyckkwMlNwZEl2bzJlQzc3Y05sQjhsbGNkNDlpWU9ZYWdRM0R1RUpwcEwzeGJBTDk3UUJpaEVieEVOTzluWFFlSDd3VjRIalhnaF9Na3paelFjN2gyU2p5djJYSlRSMEwwVllJeERfQXZWYTVLYXow?oc=5) |
| SecurityWeek | Hackers Target Zimbra Servers in Active Exploitation Campaign | 2026-08-20 09:46 | [Source Link](https://news.google.com/rss/articles/CBMilgFBVV95cUxPUkw4ZnlUZlFfamxxdC14ZkZMc3Z1X1FVVDE1cEhUd2ZZcGgyNHBrRUFZaHBOYlNqT0ZHRG9GazR4TmVOY1lxMFVyX1pwYUttY2t6bmluVHpRcEQ0OEw2T0oyc19XWHVjTDM0aVB3V1dBYlhIalFmUnhnTFBpM05JbHFqTnRQc0FJUV8zdS1xNWd6M2p0eUHSAZsBQVVfeXFMTk1WX1F1cm1PNXVWYVdacm9od3BnNVNTZG5qeHBBVkc3aHFvTTdzSzZrNUJ6dlM3Sk5Bel8tX01PTTZ3SW5wSVRxQ1g0NVRHSHFDS3M0b0o5bWlNTTZUZWVLZ1NwS0VCcEZRd1NhckFHcnVJM0kta0lJTkk2WUtxWUpVbjNYZTQ2UGVXRjF2UndtcGt0SWd1bVpjS00?oc=5) |
| CCB Belgium | Warning: Actively Exploited Remote Code Execution in Zimbra Collaboration , Patch Immediately! | 2026-08-20 09:46 | [Source Link](https://news.google.com/rss/articles/CBMivgFBVV95cUxQaHgwRkNfR3ZVSE1FUTgyM2hUT2dqd0VnRXNNcl9sejVBbG5QT3BWQ1JnZktpWExtZzVHaXBZV3Q5X2pRdDNFV3lNeEN4TnFQTG92bjRqTXpndHprcXAyQVdheVExdHVPNm5qX3FVM211RXJUUXVwRDVZdUhGdWVfeWFPU3FRTm5kWDVhU21wNHliRjcyMHRqNzVXd0JncGxwckFRa201UDFrSndvRXFpTWlNRkJDSVBWdDVVY0N3?oc=5) |
| heise online | Zimbra: Warning of attacks on command injection vulnerability | 2026-08-20 09:46 | [Source Link](https://news.google.com/rss/articles/CBMipgFBVV95cUxOV3IwSmFsLTh2Y1hKWXNzVzlic08zVEl0M3BiMXRGWDhSNk5wT2F2cXU4eHd4d0YtNFlfLXQ4Y3hZZHJzM0hFOXpSUUljSjRnZ3lYUnJhMTh2Uy1ULVZFUmo1cS1ZWTctd1d3TVFORTEwa1I1RzVnQWlwdFJtdC1UMHBJa2YtdWdhWjFVUlJUUERKUDN3QnZfVWJTWDZVek5lbzgwai13?oc=5) |
| SecurityWeek | Hackers Target Zimbra Servers in Active Exploitation Campaign | 2026-08-20 09:46 | [Source Link](https://news.google.com/rss/articles/CBMilgFBVV95cUxPUkw4ZnlUZlFfamxxdC14ZkZMc3Z1X1FVVDE1cEhUd2ZZcGgyNHBrRUFZaHBOYlNqT0ZHRG9GazR4TmVOY1lxMFVyX1pwYUttY2t6bmluVHpRcEQ0OEw2T0oyc19XWHVjTDM0aVB3V1dBYlhIalFmUnhnTFBpM05JbHFqTnRQc0FJUV8zdS1xNWd6M2p0eUE?oc=5) |
| The Hacker News | Attackers Exploit Zimbra SNMP Flaw for Unauthenticated Remote Code Execution | 2026-08-20 09:46 | [Source Link](https://news.google.com/rss/articles/CBMigwFBVV95cUxNRGdiYVN2d0pfa21mZ2czUTlhd2lUWVJtbTNRTGtUTkp6UTBmOUhPZTlQM1NhY1dpTDZxdTFudG9sUElud25oMEtES2FlYkVNVkhJTklwQ19RNV83eHpaWUtvbUNHU0VYVHVtWmZZd2MxY2o2V2JsekoydmF4SDNzMDVsQQ?oc=5) |
| BleepingComputer | Critical Zimbra RCE flaw now actively exploited in attacks | 2026-08-20 09:46 | [Source Link](https://news.google.com/rss/articles/CBMiqgFBVV95cUxNLUlsR25UUlVSZ29OS0pQUGhSOFZLa0NUdTF2bFZlaWhBd3d6ZXdDTnpjdlBTRlFrNGdCLTBNcnNLRkswVUxVSTV6OXBjc0dGTHVYR09mcXJXY2FJWU41WjJESVBSbW1wWHZrSF9Xb3RBX0MzYm5wRUtpdlNDVTVHUnRiX3N2cWZuSEJjWHdxRW1TX2tZUFhmN19DRXRhd21rSEZYTVlGVVBtd9IBrwFBVV95cUxQdE93WnFHQ0dVQTdDbkZCWW84Rjk3ZE5ld1VzamhDRlB6dVY2OVhBUWYzX1U5OGtOcy1xdnBxZGlnZHNucV96Q3VOSEVrR3dkclhjUnJEOFFheVQ4LXhudEdjWG5lMnRVVUdLTlB4VjFuVEhVRzNfUlBvT0xRR1QwVTVzcDVtTi0tQV9ySEs2aUdXRGY4bWU1dncxZ0dHWDQ3X1F6cUJZUVl) |

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*Canonical Source: https://www.newsylist.com/trend/2026-08-21/critical-zimbra-rce-flaw-now-actively-exploited-in-attacks*
*Synthesized by Newsylist Open Intelligence Engine under E-E-A-T journalistic standards.*