GHSA-3753-m2x2-q623

Source

https://github.com/advisories/GHSA-3753-m2x2-q623

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-3753-m2x2-q623/GHSA-3753-m2x2-q623.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-3753-m2x2-q623

Aliases

CVE-2026-91127

Published

2026-09-18T17:19:42Z

Modified

2026-09-18T17:30:10Z

Severity

8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N CVSS Calculator

Summary

File Viewer: DOM XSS via unsafe hyperlink schemes in the legacy DOC renderer

Details

Summary

Before 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.

Impact

Applications 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.

Fix

Version 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.

Thanks to @shashank420 for responsibly reporting this issue.

Database specific

{
    "cwe_ids": [
        "CWE-79",
        "CWE-83"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-18T17:19:42Z",
    "nvd_published_at": null,
    "severity": "HIGH"
}

References

Affected packages

npm / @file-viewer/doc

Package

Name: @file-viewer/doc; View open source insights on deps.dev
Purl: pkg:npm/%40file-viewer/doc

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.3.1

Database specific

last_known_affected_version_range

"<= 2.3.0"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-3753-m2x2-q623/GHSA-3753-m2x2-q623.json"

npm / msdoc-viewer

Package

Name: msdoc-viewer; View open source insights on deps.dev
Purl: pkg:npm/msdoc-viewer

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

0.2.2

Database specific

last_known_affected_version_range

"<= 0.2.1"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-3753-m2x2-q623/GHSA-3753-m2x2-q623.json"