KEV Entry

CVE-2026-73570

Known Exploited Vulnerability Entry CISA

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Entry Details
Confirmed Exploited

CVE-2026-73570

2026-08-21 00:00 UTC

Timestamps

2026-08-21

2026-08-21

Scope

Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability | Affected: Synacor / Zimbra Collaboration Suite (ZCS) | Description: Zimbra Collaboration Suite (ZCS) contains an OS command injection vulnerability which could allow an unauthenticated attacker to send specially crafted SMTP requests that may result in execution of arbitrary operating system commands as the Zimbra user. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-08-24 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://blog.zimbra.com/2026/07/patch-release-update-zimbra-10-1-20/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-73570

References
  • {'id': 'CVE-2026-73570', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-73570'}

f8846663-2283-4a00-a693-54d43a5f985d

CISA
405284c2-e461-4670-8979-7fd2c9755a60

2026-08-21 17:00 UTC

2026-08-21 17:00 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-78"
  ],
  "date_added": "2026-08-21",
  "due_date": "2026-08-24",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "Zimbra Collaboration Suite (ZCS)",
  "vendorProject": "Synacor",
  "vulnerabilityName": "Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability"
}
 -
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