CVE-2026-31876

MEDIUM
2026-03-11 [email protected]
5.4
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 22:07 vuln.today
CVE Published
Mar 11, 2026 - 19:16 nvd
MEDIUM 5.4

Tags

XSS Notesnook Mobile Notesnook Desktop

Description

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.

Analysis

Stored XSS in Notesnook Mobile and Desktop versions prior to 3.3.9 allows authenticated users to execute arbitrary JavaScript by injecting malicious code into Twitter/X embed URLs through the editor component. An attacker with user account access can craft a malicious note containing a specially crafted embed URL that executes when the note is viewed, potentially compromising user data or session tokens. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

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Priority Score

27
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +27
POC: 0

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CVE-2026-31876 vulnerability details – vuln.today
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