What is CVE-2026-31876?

CVE-2026-31876 is a medium-severity vulnerability in Streetwriters Notesnook, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-11.

How severe is CVE-2026-31876?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Streetwriters Notesnook

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() f…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (12.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Streetwriters Notesnook — versions < 3.3.9

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

https://github.com/streetwriters/notesnook/security/advisories/GHSA-jprx-2w2h-4rh5 (x_refsource_CONFIRM)
https://github.com/streetwriters/notesnook/commit/e87f5e5f899f45df28d7c0f33f15e9178d1fbcb7 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-31876?: CVE-2026-31876 is a medium-severity vulnerability in Streetwriters Notesnook, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-11.
How severe is CVE-2026-31876?: Medium severity. CVSS v3 base score is 5.4 out of 10.