# CVE-2026-93643

Unauthenticated RCE in Zimbra OnlyOffice via path-traversal in public Briefcase.

- Page: https://www.vulneraibility.com/cve/CVE-2026-93643
- CVSS: 9.8
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.96% (percentile 61.8)
- CISA SSVC: exploitation none, automatable yes, technical impact total (assessed 2026-09-25)
- Weakness: CWE-22, CWE-863
- Published: 2026-09-25

## Affected versions

- Zimbra Zimbra Collaboration Suite (ZCS): affected < 10.1.21

A version outside these ranges is not a statement that it is unaffected.

## Impact

Unauthenticated path-traversal write enabling command execution as 'zimbra' user, allowing full system compromise.

## Action

Immediate action required

## Recommendation

Apply vendor patch ASAP; if unavailable, disable OnlyOffice or public Briefcase access.

## References

- [advisory] https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.