{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-33370", "tracking": { "current_release_date": "2026-04-01T18:27:44.692811Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33370", "initial_release_date": "2026-03-19T12:37:59.026119Z", "revision_history": [ { "date": "2026-03-19T12:37:59.026119Z", "number": "1", "summary": "CVE created.| Source connected.| CVE status created. (valid)| Description created for source.| Products connected (1)." }, { "date": "2026-03-19T12:38:06.337768Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-20T18:27:13.084549Z", "number": "3", "summary": "Source connected.| CVE status created. (valid)| Products connected (1).| References created (5)." }, { "date": "2026-03-20T18:27:17.022857Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-20T18:33:58.396335Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (4)." }, { "date": "2026-03-20T18:34:17.362232Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (4)." }, { "date": "2026-03-20T21:06:52.084315Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-21T15:22:57.822812Z", "number": "8", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-21T15:23:00.238023Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-23T17:27:53.487291Z", "number": "10", "summary": "CVSS created.| CWES updated (1)." }, { "date": "2026-03-23T17:28:01.640460Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-23T18:12:27.157382Z", "number": "12", "summary": "CVSS created.| CWES updated (1).| Unknown change." }, { "date": "2026-03-23T18:12:31.856222Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-04-01T18:27:07.202569Z", "number": "14", "summary": "Products connected (1).| Product Identifiers created (1)." }, { "date": "2026-04-01T18:27:08.981494Z", "number": "15", "summary": "NCSC Score updated." } ], "status": "interim", "version": "15" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:zimbra/10.1.16", "product": { "name": "vers:zimbra/10.1.16", "product_id": "CSAFPID-5851590" } } ], "category": "product_name", "name": "Collaboration" } ], "category": "vendor", "name": "Zimbra" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<10.1.16", "product": { "name": "vers:unknown/<10.1.16", "product_id": "CSAFPID-5850920" } } ], "category": "product_name", "name": "Zimbra" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=10.0.0|<10.1.16", "product": { "name": "vers:unknown/>=10.0.0|<10.1.16", "product_id": "CSAFPID-5982366", "product_identification_helper": { "cpe": "cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "zimbra_collaboration_suite" } ], "category": "vendor", "name": "Synacor" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33370", "cwe": { "id": "CWE-79", "name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')" }, "notes": [ { "category": "description", "text": "Addressed a stored XSS vulnerability in the Briefcase feature caused by inline rendering of specific uploaded file types when shared publicly.", "title": "zimbra - https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories" }, { "category": "description", "text": "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.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33370.json" }, { "category": "description", "text": "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.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33370" }, { "category": "other", "text": "0.00018", "title": "EPSS" }, { "category": "other", "text": "4.8", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'))", "title": "NCSC Score top decreasing factors" } ], "product_status": { "fixed": [ "CSAFPID-5851590" ], "known_affected": [ "CSAFPID-5850920", "CSAFPID-5982366" ] }, "references": [ { "category": "external", "summary": "Source - zimbra", "url": "https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0388.json" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33370.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33370" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0388.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0388" }, { "category": "external", "summary": "Reference - certbundde; cveprojectv5; nvd", "url": "https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://blog.zimbra.com/2026/02/patch-release-update-zimbra-10-1-16/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.16" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://wiki.zimbra.com/wiki/Security_Center" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.16#Security_Fixes" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-5850920", "CSAFPID-5982366" ] } ], "title": "CVE-2026-33370" } ] }