{"id":"CVE-2026-91127","revision":null,"records":[{"revision":"7d97ebd4292c4fc182e1e64b8e62434f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-91127","aliases":[],"title":"File Viewer: DOM XSS via unsafe hyperlink schemes in the legacy DOC renderer","description":"File Viewer is a browser-native viewer for Office, PDF, CAD, archive, and other files in private and internal web applications. Prior to @file-viewer/doc 2.3.1 and msdoc-viewer 0.2.2, the legacy DOC renderer emitted document-controlled hyperlink targets into generated HTML after character escaping but without restricting URL schemes. A crafted legacy DOC file could place javascript:, vbscript:, data:, or another unsafe scheme in a rendered link, and script could execute in the embedding application's origin when a user clicked the link. The fix blocks external document links by default, allows only HTTP(S), mail, telephone, safe relative URLs, and internal bookmarks when external links are explicitly enabled, and applies mount-boundary sanitization as defense in depth. This issue is fixed in @file-viewer/doc 2.3.1 and msdoc-viewer 0.2.2.","state":0,"publishedAt":"2026-09-18T17:18:40.37+00:00","modifiedAt":"2026-09-22T15:10:24.44+00:00","affected":[{"ecosystem":"Vendor product","name":"file-viewer","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"flyfish-dev\",\n                    \"product\": \"file-viewer\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.3.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"doc","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"@file-viewer\",\n                    \"product\": \"doc\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.3.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"msdoc-viewer","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"flyfish-dev\",\n                    \"product\": \"msdoc-viewer\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.2.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N","score":8.2,"severity":"HIGH"}],"references":["https://github.com/flyfish-dev/file-viewer/security/advisories/GHSA-3753-m2x2-q623","https://github.com/flyfish-dev/file-viewer/commit/ef045680f8d9830a3eee9612f7df46a734361b07","https://github.com/flyfish-dev/file-viewer/releases/tag/v2.3.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-91127","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-91127","identifiers":["CVE-2026-91127"]},"retained":false,"historicalAffected":[]},{"revision":"25e703d53bc744a88185fe627d197244","observedAt":"2026-11-11T17:03:59.747+00:00","statement":{"source":"euvd","id":"EUVD-2026-83206","aliases":["CVE-2026-91127","GHSA-3753-m2x2-q623"],"title":"File Viewer is a browser-native viewer for Office, PDF, CAD, archive, and other files in private and internal web applications. Prior to @file-viewer/doc 2.3.1 and msdoc-viewer 0.2.2, the legacy DOC renderer emitted document-controlled hype…","description":"File Viewer is a browser-native viewer for Office, PDF, CAD, archive, and other files in private and internal web applications. Prior to @file-viewer/doc 2.3.1 and msdoc-viewer 0.2.2, the legacy DOC renderer emitted document-controlled hyperlink targets into generated HTML after character escaping but without restricting URL schemes. A crafted legacy DOC file could place javascript:, vbscript:, data:, or another unsafe scheme in a rendered link, and script could execute in the embedding application's origin when a user clicked the link. The fix blocks external document links by default, allows only HTTP(S), mail, telephone, safe relative URLs, and internal bookmarks when external links are explicitly enabled, and applies mount-boundary sanitization as defense in depth. This issue is fixed in @file-viewer/doc 2.3.1 and msdoc-viewer 0.2.2.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N","score":8.2,"severity":null}],"references":["https://github.com/flyfish-dev/file-viewer/security/advisories/GHSA-3753-m2x2-q623","https://github.com/flyfish-dev/file-viewer/commit/ef045680f8d9830a3eee9612f7df46a734361b07","https://github.com/flyfish-dev/file-viewer/releases/tag/v2.3.1"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-83206","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 18, 2026, 5:18:40 PM","dateUpdated":"Sep 22, 2026, 3:10:24 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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Prior to @file-viewer/doc 2.3.1 and msdoc-viewer 0.2.2, the legacy DOC renderer emitted document-controlled hyperlink targets into generated HTML after character escaping but without restricting URL schemes. A crafted legacy DOC file could place javascript:, vbscript:, data:, or another unsafe scheme in a rendered link, and script could execute in the embedding application's origin when a user clicked the link. The fix blocks external document links by default, allows only HTTP(S), mail, telephone, safe relative URLs, and internal bookmarks when external links are explicitly enabled, and applies mount-boundary sanitization as defense in depth. This issue is fixed in @file-viewer/doc 2.3.1 and msdoc-viewer 0.2.2.","state":0,"publishedAt":"2026-09-18T18:18:02.25+00:00","modifiedAt":"2026-09-24T21:25:27.05+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N","score":8.2,"severity":"HIGH"}],"references":["https://github.com/flyfish-dev/file-viewer/commit/ef045680f8d9830a3eee9612f7df46a734361b07","https://github.com/flyfish-dev/file-viewer/releases/tag/v2.3.1","https://github.com/flyfish-dev/file-viewer/security/advisories/GHSA-3753-m2x2-q623"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91127","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-79","CWE-83"],"productCriteria":[],"sourceDates":{"published":"2026-09-18T18:18:02.250","lastModified":"2026-09-24T21:25:27.050"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-91127","identifiers":["CVE-2026-91127"]},"retained":false,"historicalAffected":[]},{"revision":"f929174ea423428fbac251ecb23db8b2","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-3753-m2x2-q623","aliases":["CVE-2026-91127"],"title":"File Viewer: DOM XSS via unsafe hyperlink schemes in the legacy DOC renderer","description":"### Summary\n\nBefore 2.3.1, the legacy `.doc` renderer emitted document hyperlink targets after HTML escaping but without a URL-scheme allowlist. A crafted `.doc` could therefore render a live `javascript:`, `vbscript:`, `data:`, or similarly unsafe link. Script could execute in the embedding origin if a viewer clicked it.\n\n### Impact\n\nApplications rendering untrusted legacy `.doc` files with `@file-viewer/doc` or the `msdoc-viewer` compatibility package could expose their origin to attacker-controlled script after link interaction.\n\n### Fix\n\nVersion 2.3.1 centralizes link handling, removes control-character and scheme confusion, blocks external document links by default, and in explicit allow mode accepts only HTTP(S), mail, telephone, safe relative URLs, and internal bookmarks. The renderer output is safe before mounting, with mount-boundary sanitization as defense in depth. The `msdoc-viewer` compatibility release containing the fix is 0.2.2.\n\nThanks to @shashank420 for responsibly reporting this issue.","state":0,"publishedAt":"2026-09-18T17:19:42+00:00","modifiedAt":"2026-09-18T17:30:10.1333608+00:00","affected":[{"ecosystem":"npm","name":"@file-viewer/doc","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.3.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"msdoc-viewer","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.2.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/flyfish-dev/file-viewer/security/advisories/GHSA-3753-m2x2-q623","https://github.com/flyfish-dev/file-viewer/commit/ef045680f8d9830a3eee9612f7df46a734361b07","https://github.com/flyfish-dev/file-viewer","https://github.com/flyfish-dev/file-viewer/releases/tag/v2.3.1"],"sourceUrl":"https://github.com/advisories/GHSA-3753-m2x2-q623","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-3753-m2x2-q623","identifiers":["GHSA-3753-m2x2-q623","CVE-2026-91127"]},"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-0580dcc98aaa46a8935f8ff576f25037","complete":true,"records":13764,"lastAttemptAt":"2026-11-12T11:56:20.2141865+00:00","lastSuccessAt":"2026-11-12T11:56:20.209+00:00","error":null,"lastVerifiedAt":"2026-11-12T11:56:20.209+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13817,"expectedIdentifiers":13817,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. 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