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3.7

Zimbra Collaboration Suite allows unlimited password guessing

CVE-2026-93637 · published 4 days ago
Summary

Versions 10.1.0 through 10.1.21 of Zimbra Collaboration Suite let an unauthenticated attacker submit many password attempts without triggering the usual lock‑out counter. This means brute‑force attacks can continue unchecked, increasing the chance of a compromised account. Apply the vendor’s latest update or patch and enable stronger password policies to mitigate the risk.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
zimbra zimbra collaboration suite <= 10.1.21
Original advisory text
Zimbra Collaboration Suite GraphQL Batched Authentication Bypasses Pre-Auth Rate Limiting
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.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
3.7 Low
Exploitation
<1% chance of attack within 30 days
Type
CWE-307Improper Restriction of Excessive Authentication Attempts
Timeline
Published14 Oct 2026
Updated17 Oct 2026
First seen14 Oct 2026
Sources
CVE-2026-93637 · NVD
CVE-2026-93637 · MITRE
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