Microsoft catches hackers exploiting Zimbra bug before disclosure
An attacker can send a specially crafted email to a vulnerable internet-facing server and potentially run commands, though Redmond notes the flaw affects only servers running Zimbra's optional SNMP monitoring package with notifications enabled. REG AD googletag.cmd.push(function() { googletag.display('labrador/thereg/article/desktop/b'); }); Zimbra fixed the flaw in version 10.1.20 on July 20, but CVE-2026-73570 wasn't publicly disclosed until August 13. Between July 28 and August 7, Redmond spotted two different scanning tools probing the same part of Zimbra later used in attacks.
- ▪An attacker can send a specially crafted email to a vulnerable internet-facing server and potentially run commands, though Redmond notes the flaw affects only servers running Zimbra's optional SNMP monitoring package with notifications enab
- ▪REG AD googletag.cmd.push(function() { googletag.display('labrador/thereg/article/desktop/b'); }); Zimbra fixed the flaw in version 10.1.20 on July 20, but CVE-2026-73570 wasn't publicly disclosed until August 13.
- ▪Between July 28 and August 7, Redmond spotted two different scanning tools probing the same part of Zimbra later used in attacks.
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Story provenance
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Record
| Original publisher | www.theregister.com - Articles |
| Canonical URL | https://www.theregister.com/security/2026/10/01/microsoft-catches-hackers-exploiting-zimbra-bug-before-disclosure/5300543 |
| Publication time | Thu, 01 Oct 2026 16:44:00 +0200 |
| Retrieval time | 2026-10-01T14:57:31.890Z |
| Last seen | 2026-10-01T14:57:31.890Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | UcZTIGxHlIp5 · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
(function() { let windowUrl = window.location.href; windowUrl = windowUrl.substring(windowUrl.indexOf('?') + 1); let messageElement = document.querySelector('.shareableMessage'); if (windowUrl && windowUrl.includes('code') && windowUrl.includes('expires')) { messageElement.style.display = 'block'; } })(); security Microsoft catches hackers exploiting Zimbra bug before disclosure Attackers were probing the mail server flaw weeks before it had a CVE to its name Carly Page Carly Page Published thu 1 Oct 2026 // 15:44 UTC READ MORE Azure maintenance mess disrupted hybrid clouds, VPNs, cloudy VMware services 14 hours ago 16-year-old researcher found a Microsoft bug, got admin access to databases with 17.3 trillion rows 20 hours ago Drunk Van Halen fan called Microsoft support and demanded to…
Excerpt limited to ~120 words for fair-use compliance. The full article is at www.theregister.com - Articles.