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Vulnerability record · CVE-2026-40262 · published 17 April 2026

CVE-2026-40262: Cross-site scripting vulnerability

Note Mark is an open-source note-taking application. In versions 0.19.1 and prior, the asset delivery handler serves uploaded files inline and relies on magic-byte detection for content type, which does not identify text-based formats such as HTML, SVG, or XHTML. These files are served with an empty Content-Type, no X-Content-Type-Options: nosniff header, and inline disposition, allowing browsers to sniff and render active content. An authenticated user can upload an HTML or SVG file containing JavaScript as a note asset, and when a victim navigates to the asset URL, the script executes under the application's origin with access to the victim's authenticated session and API actions. This issue has been fixed in version 0.19.2.

8.7 CVSS 3.1 High EPSS 0.42% · top 66.6% CWE-79 · Cross-site scriptingCWE-434 · Unrestricted file upload Deferred
8.7CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

Note Mark is an open-source note-taking application. In versions 0.19.1 and prior, the asset delivery handler serves uploaded files inline and relies on magic-byte detection for content type, which does not identify text-based formats such as HTML, SVG, or XHTML. These files are served with an empty Content-Type, no X-Content-Type-Options: nosniff header, and inline disposition, allowing browsers to sniff and render active content. An authenticated user can upload an HTML or SVG file containing JavaScript as a note asset, and when a victim navigates to the asset URL, the script executes under the application's origin with access to the victim's authenticated session and API actions. This issue has been fixed in version 0.19.2.

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

References

LinkTags
https://github.com/enchant97/note-mark/commit/6bb62842ccb956870b9bf183629eba95e326e5e3
https://github.com/enchant97/note-mark/releases/tag/v0.19.2
https://github.com/enchant97/note-mark/security/advisories/GHSA-9pr4-rf97-79qh

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Source: NIST National Vulnerability Database (record CVE-2026-40262), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.