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        "cveId": "CVE-2026-93631",
        "assignerOrgId": "9974b330-7714-4307-a722-5648477acda7",
        "state": "PUBLISHED",
        "assignerShortName": "rapid7",
        "dateReserved": "2026-09-18T12:22:34.911Z",
        "datePublished": "2026-10-23T13:23:34.952Z",
        "dateUpdated": "2026-10-28T19:51:18.814Z"
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            "title": "Zimbra Collaboration Suite OAuth Extension Cross-Site Request Forgery Enables Account Linking",
            "datePublic": "2026-10-23T12:51:00.000Z",
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                            "cweId": "CWE-352",
                            "description": "CWE-352 Cross-Site request forgery (CSRF)",
                            "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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                    "lang": "en",
                    "value": "A cross-site request forgery vulnerability in the OAuth extension of Zimbra Collaboration Suite (ZCS) Network Edition allows an attacker to link an attacker-controlled external account to a victim's mailbox. The OAuth callback does not bind its state value or authorization code to the initiating Zimbra session and instead selects the destination mailbox from the browser's current authentication cookie. On a deployment with the provider configured, an attacker can induce a signed-in victim to load a callback containing a fresh code for the attacker's provider account. This creates a persistent data source that imports attacker-controlled contacts or events. With bidirectional CalDAV synchronization, appointments subsequently created or edited in the linked calendar are also disclosed to the attacker. ZCS 10.1.16 and 10.1.20 are affected.",
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                        }
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            "references": [
                {
                    "url": "https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories",
                    "tags": [
                        "vendor-advisory"
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                },
                {
                    "url": "https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/",
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                        "related"
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                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "REQUIRED",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "LOW",
                        "availabilityImpact": "NONE",
                        "baseSeverity": "HIGH",
                        "baseScore": 7.1,
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N"
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                {
                    "lang": "en",
                    "value": "Jonah Burgess (CryptoCat), Senior Security Researcher, Rapid7",
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                                "timestamp": "2026-10-28T17:48:50.805132Z",
                                "id": "CVE-2026-93631",
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