← Vulnerability feed

Vulnerability record · CVE-2026-91127 · published 18 September 2026

CVE-2026-91127: Cross-site scripting vulnerability

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.

8.2 CVSS 3.1 High EPSS 0.40% · top 68.8% CWE-79 · Cross-site scriptingCWE-83 · CWE-83 Deferred
8.2CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
24 Sep 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

References

LinkTags
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

Track CVE-2026-91127 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

6.1CVE-2026-42897Microsoft Exchange Server XSS enables spoofingMicrosoft Exchange Server and Exchange Server Subscription Edition fail to neutralize input during web page generation, a cross-site scripting flaw (…KEVEPSS 0.52%analysed6.1CVE-2025-48700Zimbra Classic UI stored XSS via crafted email HTMLZimbra Collaboration Suite Classic UI fails to properly sanitize HTML content in email messages, allowing crafted tag structures and attribute values…KEVEPSS 1.7%analysed6.1CVE-2025-66376Zimbra Collaboration Classic UI stored XSS via CSS @import in emailZimbra Collaboration Suite 10 before 10.0.18 and 10.1 before 10.1.13 allows stored cross-site scripting in the Classic UI through CSS @import directi…KEVEPSS 20%analysed6.1CVE-2025-68461Roundcube Webmail XSS via SVG animate tagRoundcube Webmail before 1.5.12 and 1.6 before 1.6.12 is vulnerable to cross-site scripting through the animate tag in an SVG document. Because the f…KEVEPSS 27%analysed10.0CVE-2026-22769Dell RecoverPoint for Virtual Machines hardcoded credential flawDell RecoverPoint for Virtual Machines versions prior to 6.0.3.1 HF1 contain a hardcoded credential vulnerability (CWE-798). An unauthenticated remot…KEVEPSS 13%analysed7.1CVE-2025-14611Gladinet CentreStack and Triofox hardcoded AES key enables file inclusionCentreStack and Triofox before 16.12.10420.56791 use hardcoded values in their AES cryptoscheme, weakening protection for publicly exposed endpoints.…KEVEPSS 53%analysed5.4CVE-2021-26829OpenPLC ScadaBR stored XSS via system_settings.shtmOpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored cross-site scripting through system_settings.shtm. Because the inj…KEVEPSS 48%analysed5.4CVE-2025-27915Zimbra Classic Web Client stored XSS via ICS file HTMLZimbra Collaboration Suite 9.0, 10.0 and 10.1 fail to sanitize HTML content in ICS files in the Classic Web Client. A malicious ICS entry embedded in…KEVEPSS 4.0%analysed

Source: NIST National Vulnerability Database (record CVE-2026-91127), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.