Is CVE-2026-93647 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-93647?

CVE-2026-93647 has a CVSS v3 severity of CRITICAL (9.3).

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CVE-2026-93647

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.