CVE-2026-93647
Zimbra Collaboration Suite Classic Web Client Stored Cross-Site Scripting via Crafted Calendar COUNTER Message From Address
- State
- Published
- Severity
- 9.3 Critical
- Published
- Sep 25, 2026
- Updated
- Sep 28, 2026
- Reserved
- Sep 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.3 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N | rapid7 |
Weaknesses
- CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')
Affected Products
| Product | Versions |
|---|---|
Zimbra Collaboration Suite (ZCS)Zimbra |
|
References
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisoriesvendor-advisory
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