{"id":"CVE-2026-93630","revision":null,"records":[{"revision":"00d87fbcf8be495cb0d39e19ac06c230","observedAt":"2026-10-23T16:01:20.601+00:00","statement":{"source":"cve-program","id":"CVE-2026-93630","aliases":[],"title":"Zimbra Collaboration Suite Email HTML Sanitizer Bypass via Hostname Canonicalization","description":"A hostname canonicalization vulnerability in the email HTML sanitizers of Zimbra Collaboration Suite (ZCS) allows an unauthenticated sender to bypass the restriction on forms that target the Zimbra host. DefangFilter and the OWASP ActionAttributePolicy compare the form-action hostname with the request hostname before browser URL canonicalization. A percent-encoded hostname can therefore survive sanitization while the browser submits the form to the normal Zimbra origin with the recipient's authentication cookie. This permits authenticated form requests from a crafted email after the recipient opens it in Classic and submits the form. The issue is present in ZCS 10.1.16 and 10.1.21. It does not bypass an endpoint's CSRF-token checks; a state-changing attack additionally requires an endpoint that accepts the resulting request without that protection.","state":0,"publishedAt":"2026-10-23T13:21:39.551+00:00","modifiedAt":"2026-10-23T13:21:39.551+00:00","affected":[{"ecosystem":"Vendor product","name":"Zimbra Collaboration Suite","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Zimbra\",\n                    \"product\": \"Zimbra Collaboration Suite\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThan\": \"10.1.21\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","score":4.3,"severity":"MEDIUM"}],"references":["https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories","https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93630","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93630","identifiers":["CVE-2026-93630"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-3c3fdf72295742c7a66e189e2b63cb9e","complete":false,"records":5734,"lastAttemptAt":"2026-10-27T20:00:28.3741297+00:00","lastSuccessAt":"2026-10-27T20:00:28.37+00:00","error":null,"lastVerifiedAt":"2026-10-27T20:00:28.37+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":1000,"expectedIdentifiers":13501,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-10-27T19:48:20.2022313+00:00","complete":true,"records":1093,"lastAttemptAt":"2026-10-27T19:48:20.2022313+00:00","lastSuccessAt":"2026-10-27T19:48:20.4010872+00:00","error":null,"lastVerifiedAt":"2026-10-27T19:48:20.4010877+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-3bd7ce170fa9469593b2b05a4c145743","complete":true,"records":13438,"lastAttemptAt":"2026-10-27T19:48:21.6831828+00:00","lastSuccessAt":"2026-10-27T19:48:21.679+00:00","error":null,"lastVerifiedAt":"2026-10-27T19:48:21.679+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13501,"expectedIdentifiers":13501,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-0a9352f15ff9b42ef0668815b17985da54b0862a5d24cb9a13f2a99c14c0f811","complete":true,"records":9785,"lastAttemptAt":"2026-10-27T19:48:20.0598535+00:00","lastSuccessAt":"2026-10-27T19:48:19.7606489+00:00","error":null,"lastVerifiedAt":"2026-10-27T19:48:20.0598535+00:00","snapshotPublishedAt":"2026-10-27T19:18:07+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-bad5d31e7f6a5e3d338e11d8789069b63620a403f927730769688b42f768e4f6","complete":true,"records":1965,"lastAttemptAt":"2026-10-27T19:46:06.3074736+00:00","lastSuccessAt":"2026-10-26T16:35:43.1460623+00:00","error":null,"lastVerifiedAt":"2026-10-27T19:46:06.3074736+00:00","snapshotPublishedAt":"2026-10-26T16:18:29+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-3a5b306d60fc44677a03a8afc99d87e6c5402770ef68d560f94a8c3ad3802b75","complete":true,"records":3001,"lastAttemptAt":"2026-10-27T19:48:20.1662846+00:00","lastSuccessAt":"2026-10-27T16:45:49.0050993+00:00","error":null,"lastVerifiedAt":"2026-10-27T19:48:20.1662846+00:00","snapshotPublishedAt":"2026-10-27T16:33:43+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-fc1c62e1c2d70dda08a497ed7a59029d5d84def9eb7702ebf314b9dadea06e2f","complete":true,"records":230836,"lastAttemptAt":"2026-10-27T19:48:10.3426958+00:00","lastSuccessAt":"2026-10-27T19:48:08.9643671+00:00","error":null,"lastVerifiedAt":"2026-10-27T19:48:10.3426958+00:00","snapshotPublishedAt":"2026-10-27T19:18:16+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}