{"cve":"CVE-2026-91127","nvd":{"published":"2026-09-18T18:18:02.250","modified":"2026-09-24T21:25:27.050","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-79","CWE-83"],"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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:55:23.253742848+00:00"},"epss":{"cve":"CVE-2026-91127","score":0.00397,"percentile":0.33884,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-3753-m2x2-q623","url":"https://osv.dev/vulnerability/GHSA-3753-m2x2-q623","summary":"File Viewer: DOM XSS via unsafe hyperlink schemes in the legacy DOC renderer","modified":"2026-09-18T17:30:10.133360774Z","packages":[{"ecosystem":"npm","name":"@file-viewer/doc","purl":"pkg:npm/%40file-viewer/doc","ranges":["<2.3.1"],"fixed":["2.3.1"]},{"ecosystem":"npm","name":"msdoc-viewer","purl":"pkg:npm/msdoc-viewer","ranges":["<0.2.2"],"fixed":["0.2.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}