CVEvulnerability

CVE-2026-40262

8.7 HIGH Published 2026-04-17 Modified 2026-10-26 Official page ↗
Status
Deferred
Published
2026-04-17
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.7 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Weaknesses
CWE-434, CWE-79

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.

Related

Weakness · CWE (2)

  • CWE-434 Unrestricted Upload of File with Dangerous Type weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References