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    CVE-2026-31876

    Notesnook is a note-taking app focused on user privacy & ease of use. Prior to 3.3.9, a Stored Cross-Site Scripting (XSS) vulnerability existed in Notesnook's editor embed component when rendering Twitter/X embed URLs. The tweetToEmbed() function in component.tsx interpolated the user-supplied URL directly into an HTML string without escaping, which was then assigned to the srcdoc attribute of an <iframe>. This vulnerability is fixed in 3.3.9.

    Published:Mar 11, 2026
    Last Modified:Mar 20, 2026
    EPS:Mar 11, 2026
    EPSS Score:0.0003
    CVSS Score:5.4

    Affected Products

    Vendor
    Streetwriters
    Product
    Notesnook
    Vendor
    Streetwriters
    Product
    Notesnook Desktop
    Vendor
    Streetwriters
    Product
    Notesnook Mobile

    Exploits

    No exploit reference

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High