CVE-2026-93642 — CRITICAL (9.3)

Vulnerability Description

An unauthenticated sender can forge a share notification that triggers stored XSS when a signed-in Zimbra Modern recipient clicks Accept Share, allowing the attacker to access mailbox data and act as the victim.

CVSS Score

9.3

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

NONE

Related Weaknesses (CWE)

CWE-79

References

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

FAQ

What is CVE-2026-93642?

CVE-2026-93642 is a vulnerability with a CVSS score of 9.3 (CRITICAL). An unauthenticated sender can forge a share notification that triggers stored XSS when a signed-in Zimbra Modern recipient clicks Accept Share, allowing the attacker to access mailbox data and act as ...

How severe is CVE-2026-93642?

CVE-2026-93642 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-93642?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.