CVE-2026-91127 File Viewer - Stored XSS

File Viewer @file-viewer/doc < 2.3.1 and msdoc-viewer < 0.2.2 contain a stored XSS caused by unsafe URL schemes in legacy DOC renderer hyperlink targets, letting attackers execute scripts in the embedding application's origin, exploit requires user clicking crafted link.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.40% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Stored XSS
Impact
Client Script Exec
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Published
18 September 2026
Updated
15 October 2026
Weakness
CWE-79

Vendor fix

Update to @file-viewer/doc 2.3.1 and msdoc-viewer 0.2.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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