CVE-2026-93643: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in Zimbra Zimbra Collaboration Suite (ZCS)
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-93643) in Zimbra Collaboration Suite (ZCS) involves improper limitation of a pathname to a restricted directory (CWE-22). When OnlyOffice/Document Editing is enabled, an unauthenticated attacker who can access a supported public Briefcase document can abuse unsigned save fields to perform path traversal writes. This allows the attacker to write files outside the intended directory, potentially leading to command execution as the zimbra user. The affected versions are all ZCS versions prior to 10.1.21.
Potential Impact
Successful exploitation allows an unauthenticated remote attacker to write files arbitrarily on the server via path traversal and execute commands with the privileges of the zimbra user. This results in full compromise of the affected system's confidentiality, integrity, and availability.
Mitigation Recommendations
A fix is available in Zimbra Collaboration Suite version 10.1.21 and later. Users should upgrade to version 10.1.21 or newer to remediate this vulnerability. No other mitigation or temporary workaround is specified.
CVE-2026-93643: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in Zimbra Zimbra Collaboration Suite (ZCS)
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 v3.1
Score 9.8critical
Affected software
Zimbra
Zimbra Collaboration Suite (ZCS)
pkg:github/zimbra/zimbra-collaboration-suiteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-93643) in Zimbra Collaboration Suite (ZCS) involves improper limitation of a pathname to a restricted directory (CWE-22). When OnlyOffice/Document Editing is enabled, an unauthenticated attacker who can access a supported public Briefcase document can abuse unsigned save fields to perform path traversal writes. This allows the attacker to write files outside the intended directory, potentially leading to command execution as the zimbra user. The affected versions are all ZCS versions prior to 10.1.21.
Potential Impact
Successful exploitation allows an unauthenticated remote attacker to write files arbitrarily on the server via path traversal and execute commands with the privileges of the zimbra user. This results in full compromise of the affected system's confidentiality, integrity, and availability.
Mitigation Recommendations
A fix is available in Zimbra Collaboration Suite version 10.1.21 and later. Users should upgrade to version 10.1.21 or newer to remediate this vulnerability. No other mitigation or temporary workaround is specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- rapid7
- Date Reserved
- 2026-09-18T12:22:38.559Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab67f25f7a7c54106db3e7d
Added to database: 09/25/2026, 14:03:17 UTC
Last enriched: 09/25/2026, 14:17:52 UTC
Last updated: 09/26/2026, 02:48:10 UTC
Views: 20
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.