CVE-2026-33370

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*", "matchCriteriaId": "E8DBE536-EAB0-48FF-A195-C0DB0A7FBCA0", "versionEndExcluding": "10.1.16", "versionStartIncluding": "10.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue was discovered in Zimbra Collaboration (ZCS) 10.0 and 10.1. A stored cross-site scripting (XSS) vulnerability exists in the Zimbra Briefcase feature due to insufficient sanitization of specific uploaded file types. When a user opens a publicly shared Briefcase file containing malicious scripts, the embedded JavaScript executes in the context of the user's session. This allows an attacker to run arbitrary scripts, potentially leading to data exfiltration or other unauthorized actions on behalf of the victim user."}, {"lang": "es", "value": "Se descubri\u00f3 un problema en Zimbra Collaboration (ZCS) 10.0 y 10.1. Existe una vulnerabilidad de cross-site scripting (XSS) almacenado en la funci\u00f3n Zimbra Briefcase debido a una sanitizaci\u00f3n insuficiente de tipos de archivos subidos espec\u00edficos. Cuando un usuario abre un archivo de Briefcase compartido p\u00fablicamente que contiene scripts maliciosos, el JavaScript incrustado se ejecuta en el contexto de la sesi\u00f3n del usuario. Esto permite a un atacante ejecutar scripts arbitrarios, lo que podr\u00eda llevar a la exfiltraci\u00f3n de datos o a otras acciones no autorizadas en nombre del usuario v\u00edctima."}], "id": "CVE-2026-33370", "lastModified": "2026-06-17T10:37:23.257", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33370", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-23T13:38:43.058027Z", "version": "2.0.3"}}]}, "published": "2026-03-20T14:16:16.127", "references": [{"source": "cve@mitre.org", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://wiki.zimbra.com/wiki/Security_Center"}, {"source": "cve@mitre.org", "tags": ["Release Notes"], "url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.16#Security_Fixes"}, {"source": "cve@mitre.org", "tags": ["Product"], "url": "https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Analyzed", "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": "10.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "10.1"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "collaboration", "vendor": "zimbra"}], "analysis": {"en": {"generated_at": "2026-04-02T05:19:10.950162+00:00", "value": {"mitigation_remediation": ["Upgrade Zimbra Collaboration Suite to version 10.1.16 or later.", "Restrict or revoke public access to Briefcase folders.", "Limit or disable upload of file types that can contain embedded scripts in Briefcase.", "Ensure the Briefcase preview engine does not execute user\u2011provided scripts by applying proper XSS filtering."], "summary": {"action": "Apply Patch", "impact": "Stored cross\u2011site scripting that allows arbitrary scripts to run in the victim\u2019s browser, potentially enabling data theft or other unauthorized actions."}, "threat_synthesis": {"affected_systems": "Synacor Zimbra Collaboration Suite versions 10.0 and 10.1 are affected. Any installation that uses the Briefcase feature and shares its contents publicly is vulnerable.", "description_and_impact": "A stored cross\u2011site scripting flaw exists in the Zimbra Briefcase feature. The application fails to sanitize particular uploaded file types, letting an attacker embed malicious JavaScript. When a user opens a publicly shared Briefcase file containing that script, the code executes within the user\u2019s browser context, giving the attacker the ability to run arbitrary scripts under the victim\u2019s authority.", "risk_and_exploitability": "The vulnerability has a CVSS score of 6.1 and an EPSS lower than 1\u202f%. It can be exploited by uploading a crafted file to a publicly accessible Briefcase folder. No special permissions on the server are required; the attacker only needs a user account with upload rights. Once the victim opens the file, the attacker\u2019s script runs, potentially exfiltrating data or performing other actions. The flaw is not listed in the KEV catalog, but its straightforward exploit path makes it an attractive target for attackers seeking to compromise user accounts without host\u2011level privileges."}}}}, "created": "2026-03-23T09:53:36.108052+00:00", "title": "Stored Cross\u2011Site Scripting in Zimbra Briefcase Enables Malicious Script Execution", "updated": "2026-04-02T07:59:40.621859+00:00", "vendors": ["zimbra", "zimbra$PRODUCT$collaboration"]}