Is CVE-2026-93642 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-93642 being exploited in the wild.

How severe is CVE-2026-93642?

Critical severity, with a CVSS score of 9.3, published 25 September 2026.

Which products and versions are affected?

Zimbra Collaboration before 10.1.21.

Is there a fix for CVE-2026-93642?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-93642 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-93642?

Check whether you run Zimbra Collaboration 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.

CVE-2026-93642: Zimbra Collaboration stored XSS in share notifications

CVE-2026-93642 · Severity: critical · CVSS 9.3 · Published 2026-09-25

Zimbra Collaboration is an email and collaboration platform used by businesses to manage mail and communications. An unauthenticated attacker can craft a forged share notification that executes malicious code when a logged-in user accepts the share, allowing the attacker to steal mailbox data and impersonate the victim within their email account.

Technologies: Zimbra Collaboration. Vendors: Zimbra.

Quick answers

Is CVE-2026-93642 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-93642 being exploited in the wild.
How severe is CVE-2026-93642?: Critical severity, with a CVSS score of 9.3, published 25 September 2026.
Which products and versions are affected?: Zimbra Collaboration before 10.1.21.
Is there a fix for CVE-2026-93642?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-93642 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-93642?: Check whether you run Zimbra Collaboration 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

This is a stored cross-site scripting (XSS) vulnerability in the Modern Web Client that is triggered when a signed-in user clicks "Accept" on a crafted share notification from an unauthenticated sender. The vulnerability allows arbitrary JavaScript execution in the victim's authenticated session, enabling mailbox access and account takeover. The fix is available in Zimbra Collaboration version 10.1.21.

Affected products

Zimbra Collaboration before 10.1.21

Timeline

2026-09-25: disclosed

References

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

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