CVE-2026-93637
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 Gra…
Published Oct 14, 2026 · updated Oct 14, 2026
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.
Code
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Timeline
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Oct 14, 2026 · NIST NVD
Detected
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.
Sources
- CVE.orgVulnerability recordCVE-2026-93637
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-93637
30-day exploitation probability 0.3%
first.org - NIST NVDVulnerability recordCVE-2026-93637
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 attem
nvd.nist.gov