CVE-2026-31876 identifies a Stored Cross-Site Scripting (XSS) vulnerability in Notesnook desktop and mobile applications prior to version 3.3.9. This flaw allowed malicious scripts to be embedded and executed when rendering Twitter/X embed URLs due to improper sanitization of user-supplied input in the editor's embed component. Rated as Medium severity (CVSS 5.4), exploitation requires a low-privileged attacker to craft a malicious URL and user interaction, potentially leading to low impacts on confidentiality and integrity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.3.9CPE matchmatch criteria | cpe:2.3:a:streetwriters:notesnook_desktop:*:*:*:*:*:*:*:* | ||
< 3.3.15CPE matchmatch criteria | cpe:2.3:a:streetwriters:notesnook_mobile:*:*:*:*:*:android:*:* | ||
< 3.3.15CPE matchmatch criteria | cpe:2.3:a:streetwriters:notesnook_mobile:*:*:*:*:*:iphone_os:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.