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CVE-2026-93637

Low3.7

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.

CVSS
3.7v3.1
EPSS (exploit probability)
0.3%21th pct
CISA KEV
Not listed

EPSS trendFIRST daily scores, last 90 days

FIRST EPSS held steady from 0.3% on 2026-10-15 to 0.3% on 2026-10-20, ranging 0.3%–0.3% across 5 daily scores.
2026-10-15 → 2026-10-20 · 5 days · 0.3%–0.3%
Daily values
FIRST EPSS daily scores for this CVE
Score dateEPSSPercentile
2026-10-200.3%20.8%
2026-10-190.3%20.7%
2026-10-180.3%20.6%
2026-10-160.3%20.6%
2026-10-150.3%20.6%

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Coverage1 article

References

Facts sourced from NVD, FIRST EPSS, and CISA KEV. Last synced 2026-10-21 08:34 UTC.

  • CVSS & description: NVD 2.0, fetched 2026-10-21 06:34 UTC
  • EPSS: FIRST EPSS, fetched 2026-10-21 08:34 UTC; score date 2026-10-20
  • KEV: CISA KEV, fetched 2026-10-21 08:34 UTC