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    "cveMetadata": {
        "cveId": "CVE-2026-93634",
        "assignerOrgId": "9974b330-7714-4307-a722-5648477acda7",
        "state": "PUBLISHED",
        "assignerShortName": "rapid7",
        "dateReserved": "2026-09-18T12:22:34.912Z",
        "datePublished": "2026-10-23T13:26:11.070Z",
        "dateUpdated": "2026-10-23T13:26:11.070Z"
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                "orgId": "9974b330-7714-4307-a722-5648477acda7",
                "shortName": "rapid7",
                "dateUpdated": "2026-10-23T13:26:11.070Z"
            },
            "title": "Zimbra Collaboration Suite Cross-Account Authorization Bypass via Forged Shared-File Records",
            "datePublic": "2026-10-23T12:55:00.000Z",
            "problemTypes": [
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                    "descriptions": [
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                            "lang": "en",
                            "cweId": "CWE-639",
                            "description": "CWE-639 Authorization bypass through User-Controlled key",
                            "type": "CWE"
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            "affected": [
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                    "vendor": "Zimbra",
                    "product": "Zimbra Collaboration Suite",
                    "versions": [
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                            "status": "affected",
                            "version": "0",
                            "lessThanOrEqual": "10.1.20",
                            "versionType": "semver"
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                    "value": "A cross-account authorization vulnerability in Zimbra Collaboration Suite (ZCS) allows an authenticated user to insert forged shared-file records into another user's mailbox through FileSharedWithMeRequest. The request bypasses delegated-account authorization and accepts attacker-selected file metadata, owner identifiers and declared sizes without validating a corresponding document share. An attacker can plant entries attributed to another real local account without that account sharing a document. No victim interaction is required. ZCS 10.1.16 and 10.1.20 are affected.",
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                            "value": "A cross-account authorization vulnerability in Zimbra Collaboration Suite (ZCS) allows an authenticated user to insert forged shared-file records into another user's mailbox through FileSharedWithMeRequest. The request bypasses delegated-account authorization and accepts attacker-selected file metadata, owner identifiers and declared sizes without validating a corresponding document share. An attacker can plant entries attributed to another real local account without that account sharing a document. No victim interaction is required. ZCS 10.1.16 and 10.1.20 are affected."
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            "references": [
                {
                    "url": "https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories",
                    "tags": [
                        "vendor-advisory"
                    ]
                },
                {
                    "url": "https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/",
                    "tags": [
                        "related"
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                        "version": "3.1",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "LOW",
                        "availabilityImpact": "NONE",
                        "baseSeverity": "MEDIUM",
                        "baseScore": 4.3,
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
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            "credits": [
                {
                    "lang": "en",
                    "value": "Jonah Burgess (CryptoCat), Senior Security Researcher, Rapid7",
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            "source": {
                "discovery": "UNKNOWN"
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