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        "cveId": "CVE-2026-93633",
        "assignerOrgId": "9974b330-7714-4307-a722-5648477acda7",
        "state": "PUBLISHED",
        "assignerShortName": "rapid7",
        "dateReserved": "2026-09-18T12:22:34.911Z",
        "datePublished": "2026-10-23T13:25:21.365Z",
        "dateUpdated": "2026-10-28T19:51:07.972Z"
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            "title": "Zimbra Collaboration Suite Briefcase CSS Sanitization Bypass via Non-ASCII Stylesheet Characters",
            "datePublic": "2026-10-23T12:54:00.000Z",
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                {
                    "descriptions": [
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                            "lang": "en",
                            "cweId": "CWE-79",
                            "description": "CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')",
                            "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 CSS sanitization vulnerability in Zimbra Collaboration Suite (ZCS) allows an authenticated user with Briefcase access to publish a document that displays attacker-controlled content under the Zimbra origin. When processing a stylesheet containing non-ASCII characters, DefangFilter appends the final ASCII segment without sanitizing it. HTML stored as application/x-zimbra-doc can therefore retain CSS URL references that the normal sanitizer removes. An attacker can share a crafted document that loads external resources and displays a credential-collection form using Zimbra's own visual assets. Exploitation requires the victim to open the document in a browser that renders the content type inline; credential theft additionally requires form submission. 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": "LOW",
                        "userInteraction": "REQUIRED",
                        "scope": "CHANGED",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "LOW",
                        "availabilityImpact": "NONE",
                        "baseSeverity": "MEDIUM",
                        "baseScore": 5.4,
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
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            "credits": [
                {
                    "lang": "en",
                    "value": "Jonah Burgess (CryptoCat), Senior Security Researcher, Rapid7",
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            "source": {
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                                "timestamp": "2026-10-28T17:48:57.736632Z",
                                "id": "CVE-2026-93633",
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