Quick answers
- Is CVE-2026-93643 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-93643 being exploited in the wild.
- How severe is CVE-2026-93643?
- Critical severity, with a CVSS score of 9.8, published 25 September 2026.
- Which products and versions are affected?
- Zimbra Collaboration Server prior to 10.1.21.
- Is there a fix for CVE-2026-93643?
- A patch was published on 2026: Fix released in Zimbra 10.1.21 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-93643 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-93643?
- Check whether you run Zimbra Collaboration Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability exists in the OnlyOffice integration when document editing is enabled. An unauthenticated attacker with access to a public Briefcase document can manipulate unsigned save fields to perform path-traversal writes, allowing arbitrary file placement and command execution as the zimbra user. The attack requires network access to the Zimbra server and a public document share, with no authentication needed.
Affected products
- Zimbra Collaboration Server prior to 10.1.21
Timeline
- 2026-09-25: disclosed
- 2026: patched: Fix released in Zimbra 10.1.21