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{
"dataType": "CVE_RECORD",
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"cveMetadata": {
"cveId": "CVE-2026-93637",
"assignerOrgId": "9974b330-7714-4307-a722-5648477acda7",
"state": "PUBLISHED",
"assignerShortName": "rapid7",
"dateReserved": "2026-09-18T12:22:38.558Z",
"datePublished": "2026-10-14T16:25:23.436Z",
"dateUpdated": "2026-10-16T15:31:51.432Z"
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"shortName": "rapid7",
"dateUpdated": "2026-10-14T16:25:23.436Z"
},
"title": "Zimbra Collaboration Suite GraphQL Batched Authentication Bypasses Pre-Auth Rate Limiting",
"datePublic": "2026-10-14T16:19:00.000Z",
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"cweId": "CWE-307",
"description": "CWE-307 Improper restriction of excessive authentication attempts",
"type": "CWE"
}
]
}
],
"affected": [
{
"vendor": "Zimbra",
"product": "Zimbra Collaboration Suite",
"versions": [
{
"status": "affected",
"version": "0",
"lessThanOrEqual": "10.1.21",
"versionType": "semver"
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],
"descriptions": [
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"lang": "en",
"value": "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.",
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"value": "<pre>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.</pre>"
}
]
}
],
"references": [
{
"url": "https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1",
"tags": [
"third-party-advisory"
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"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"availabilityImpact": "NONE",
"baseSeverity": "LOW",
"baseScore": 3.7,
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"
}
}
],
"credits": [
{
"lang": "en",
"value": "Jonah Burgess (CryptoCat), Senior Security Researcher, Rapid7",
"type": "finder"
}
],
"source": {
"discovery": "UNKNOWN"
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"id": "CVE-2026-93637",
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"timestamp": "2026-10-16T15:18:20.000158Z"
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"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-16T15:31:51.432Z"
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}