Is CVE-2026-93637 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-93637?

CVE-2026-93637 has a CVSS v3 severity of LOW (3.7).

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CVE-2026-93637

Description

An authentication rate-limit bypass in Zimbra Collaboration Suite 10.1.0 through 10.1.21 allows unauthenticated attackers to make repeated password guesses through GraphQL without incrementing Zimbra’s source-IP failure counter. GraphQL aliases allow multiple authentication attempts in one HTTP request.