Vulnerability details
CVE-2026-93643
Zimbra Collaboration Suite
Zimbra Collaboration Suite OnlyOffice Integration Path Traversal Leading to Remote Code Execution via Unauthenticated /downloadas Request
CVSS 3.1
9.8Critical
Official description
When OnlyOffice/Document Editing is available, an unauthenticated remote attacker with access to an existing supported public Briefcase document can abuse unsigned save fields to perform path-traversal writes and execute commands as zimbra.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (rapid7) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Zimbra | Zimbra Collaboration Suite (ZCS) | v < 10.1.21 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories vendor-advisory
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Details
- Published
- 2026-09-25
- Last updated
- 2026-09-26
- State
- Published
- Assigner (CNA)
- rapid7
Exploit prediction (EPSS)
0.96%
Probability of exploitation in 30 days
61.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- CWE-863Incorrect Authorization