CVE-2026-91127
Published:September 18, 2026
Updated:October 09, 2026
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.
Affected Packages
https://github.com/flyfish-dev/file-viewer.git (GITHUB):
Affected version(s) >=v2.1.12 <v2.3.1Fix Suggestion:
Update to version v2.3.1@file-viewer/doc (NPM):
Affected version(s) >=2.1.10 <2.3.1Fix Suggestion:
Update to version 2.3.1msdoc-viewer (NPM):
Affected version(s) >=0.2.0 <0.2.2Fix Suggestion:
Update to version 0.2.2Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.4
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
EPSS
Base Score:
0.40