{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-33368", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-03-23T13:22:23.589Z", "dateReserved": "2026-03-19T00:00:00.000Z", "datePublished": "2026-03-20T00:00:00.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-03-20T14:04:41.938Z"}, "descriptions": [{"lang": "en", "value": "Zimbra Collaboration Suite (ZCS) 10.0 and 10.1 contains a reflected cross-site scripting (XSS) vulnerability in the Classic Webmail REST interface (/h/rest). The application fails to properly sanitize user-supplied input, allowing an unauthenticated attacker to inject malicious JavaScript into a crafted URL. When a victim user accesses the link, the injected script executes in the context of the Zimbra webmail application, which could allow the attacker to perform actions on behalf of the victim."}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories"}, {"url": "https://wiki.zimbra.com/wiki/Security_Center"}, {"url": "https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy"}, {"url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.16#Security_Fixes"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-79", "lang": "en", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}], "metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-03-23T13:08:41.191532Z", "id": "CVE-2026-33368", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-23T13:22:23.589Z"}}]}, "dataVersion": "5.2"}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Zimbra Collaboration Suite (ZCS) 10.0 and 10.1 contains a reflected cross-site scripting (XSS) vulnerability in the Classic Webmail REST interface (/h/rest). The application fails to properly sanitize user-supplied input, allowing an unauthenticated attacker to inject malicious JavaScript into a crafted URL. When a victim user accesses the link, the injected script executes in the context of the Zimbra webmail application, which could allow the attacker to perform actions on behalf of the victim."}], "id": "CVE-2026-33368", "lastModified": "2026-03-24T15:54:09.400", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-03-20T14:16:15.810", "references": [{"source": "cve@mitre.org", "url": "https://wiki.zimbra.com/wiki/Security_Center"}, {"source": "cve@mitre.org", "url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.16#Security_Fixes"}, {"source": "cve@mitre.org", "url": "https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy"}, {"source": "cve@mitre.org", "url": "https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,10.0]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,10.1]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "collaboration", "vendor": "zimbra"}], "analysis": {"en": {"generated_at": "2026-03-23T16:06:34.839930+00:00", "value": {"mitigation_remediation": ["Upgrade Zimbra Collaboration Suite to version 10.1.16 or later to apply the vendor patch.", "If an update is not immediately available, block unauthenticated access to the Classic Webmail REST interface (/h/rest) via web server or firewall rules.", "Deploy a web application firewall rule that detects and blocks typical XSS payloads on the /h/rest endpoint.", "Educate users about identifying suspicious URLs and encourage safe browsing practices."], "summary": {"action": "Apply Patch", "impact": "Cross\u2011Site Scripting enabling abuse of victim session"}, "threat_synthesis": {"affected_systems": "The vulnerable products are Zimbra Collaboration Suite versions 10.0 and 10.1. Vendors have released a patch with the 10.1.16 update; any installation of those major versions prior to that release is affected.\n", "description_and_impact": "Zimbra Collaboration Suite 10.0 and 10.1 contain a reflected cross\u2011site scripting vulnerability in the Classic Webmail REST interface (/h/rest). The application fails to properly sanitize user supplied input, allowing an unauthenticated attacker to inject malicious JavaScript into a crafted URL. When a victim user clicks such a link, the script executes within the webmail application, which can lead to session hijacking and unauthorized actions on the victim\u2019s behalf.\n\nThis weakness falls under the common weakness enumeration CWE\u201179, illustrating a denial of input validation that permits reflected XSS payloads.\n\nThe impact is confined to the scope of a single logged\u2011in user who accesses the URL, but the consequences can extend to the entire account, including view, send, and delete capabilities.\n", "risk_and_exploitability": "The CVSS score of 6.1 indicates moderate severity. EPSS is below 1\u202f%, implying a low likelihood of widespread exploitation, and the vulnerability is not listed in CISA\u2019s KEV catalog. Attackers can trivially craft a malicious URL and entice a user to click it\u2014no authentication is required. Successful exploitation depends on user interaction but can severely compromise the victim\u2019s session if achieved.\n"}}}}, "created": "2026-03-23T09:53:37.039784+00:00", "title": "Zimbra Collaboration Suite Reflected XSS in Classic Webmail REST Interface", "updated": "2026-03-25T14:10:26.918137+00:00", "vendors": ["zimbra", "zimbra$PRODUCT$collaboration"]}