Zimbra security advisory (AV26-816)
Serial number: AV26-816 Date: August 14, 2026 As of August 13, 2026, Zimbra is affected by vulnerabilities in the following product: Collaboration - Prior to 10.1.20 The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available. Zimbra Security Advisories - Zimbra: Tech Center Zimbra Responsible Disclosure Policy - Zimbra: Tech Center Zimbra: Blog - All Things Zimbra
CSIRTS triage
- What
- Zimbra Collaboration versions prior to 10.1.20 contain vulnerabilities.
- Who is affected
- Zimbra Collaboration installations running versions before 10.1.20 are affected.
- Urgency
- Moderate; no active exploitation reported but vulnerabilities are confirmed.
- Action
- Upgrade Zimbra Collaboration to version 10.1.20 or later as patches become available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://cyber.gc.ca/en/alerts-advisories/zimbra-security-advisory-av26-816
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