CVE-2026-31876

MEDIUM

Notesnook Desktop < 3.3.9 - Stored Cross-Site Scripting via Twitter/X Embed URL

Title source: llm
STIX 2.1

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.

References (2)

Core 2

Scores

CVSS v3 5.4
EPSS 0.0004
EPSS Percentile 12.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (2)
streetwriters/notesnook_desktop < 3.3.9
streetwriters/notesnook_mobile < 3.3.15 (3 CPE variants)
Published Mar 11, 2026
Tracked Since Mar 12, 2026