Full Report
Zimbra security advisory (AV26-667)
Analysis Summary
# Vulnerability: Zimbra Daffodil Security Update (July 2026)
## CVE Details
*Note: The primary source (AV24-667) acts as a high-level bulletin. Specific CVE identifiers for the 10.1.19 release typically include fixes for multiple underlying path traversal or XSS issues commonly found in Zimbra updates.*
- **CVE ID:** Pending/Multiple (Refer to Zimbra 10.1.19 release notes)
- **CVSS Score:** Critical/High (Estimated based on typical Zimbra patch cycles)
- **CWE:** Often includes CWE-79 (Cross-site Scripting) or CWE-22 (Path Traversal)
## Affected Systems
- **Products:** Zimbra Daffodil
- **Versions:** All versions prior to v10.1.19
- **Configurations:** Default installations of Zimbra Collaboration Suite (Daffodil)
## Vulnerability Description
While the advisory (AV26-667) provides a high-level notification, updates in the 10.1.x chain typically address security regressions and vulnerabilities related to the mailbox server, web XML parsing, or administrative console access. These flaws often allow for unauthorized access to user data or remote code execution if combined with other vulnerabilities.
## Exploitation
- **Status:** Not explicitly stated as "exploited in the wild" in this bulletin, but Zimbra instances are frequent targets for automated exploitation.
- **Complexity:** Low to Medium
- **Attack Vector:** Network (Remote)
## Impact
- **Confidentiality:** High (Potential access to emails and account credentials)
- **Integrity:** High (Potential modification of mail storage or configurations)
- **Availability:** Medium (Potential service disruption during exploitation or patching)
## Remediation
### Patches
- **Zimbra Daffodil v10.1.19:** Users are advised to upgrade to this version immediately to resolve the identified security flaws.
### Workarounds
- There are no recommended workarounds that replace the need for patching.
- Restrict access to the Zimbra Administration Console (Port 7071) to trusted IP addresses only as a general security posture.
## Detection
- **Indicators of Compromise:** Monitor `/opt/zimbra/log/mailbox.log` and `/opt/zimbra/log/audit.log` for unusual administrative logins or unexpected script executions.
- **Detection Methods:** Vulnerability scanners (Nessus, OpenVAS) can be used to identify out-of-date Zimbra versions.
## References
- Zimbra Blog Patch Release: hxxps[://]blog[.]zimbra[.]com/2026/07/patch-release-update-zimbra-10-1-19/
- Zimbra Security Center: hxxps[://]blog[.]zimbra[.]com/
- Canadian Centre for Cyber Security Advisory: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/zimbra-security-advisory-av26-667