CVE-2026-93647
CRITICAL
CVSS 9.3
Published: 2026-09-25
Modified: 2026-09-26
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Threat Intelligence Pending
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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.
Quick Facts
| CVE ID | CVE-2026-93647 |
| CVSS Score | 9.3 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N |
| Published | 2026-09-25 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |