CVE-2026-93647

CRITICALCVSS 9.3

Description

An unauthenticated calendar sender can place active markup in a COUNTER message's RFC From address. Selecting the message in Zimbra Classic triggers stored XSS, allowing the attacker to access mailbox data and act as the victim.

Timeline

Published:September 25th, 2026 2:17 PM

Last modified:September 29th, 2026 9:29 PM

CVSS Scoring

CVSS v3: 9.3 (CRITICAL)

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

Weaknesses (CWE)

CWE-79

References & Reports

Advisories, patches, and third-party reports

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

Source: NIST NVD · Data may lag official sources by up to one minute