What is CVE-2021-23431?

CVE-2021-23431 is a medium-severity vulnerability in Joplinapp Joplin, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.4/10. Published 2021-08-24.

How severe is CVE-2021-23431?

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

CSRF in Joplinapp Joplin

CVE-2021-23431

The package joplin before 2.3.2 are vulnerable to Cross-site Request Forgery (CSRF) due to missing CSRF checks in various forms.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-08-24 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.004 (34.3th percentile), scored 2026-09-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Joplinapp Joplin
Joplin — versions unspecified

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

snyk.io/vuln/SNYK-JS-JOPLIN-1325537 (Patch, Third Party Advisory)
github.com/laurent22/joplin/commit/19b45de2981c09f6f387498ef96d32b4811eba5e (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-23431?: CVE-2021-23431 is a medium-severity vulnerability in Joplinapp Joplin, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.4/10. Published 2021-08-24.
How severe is CVE-2021-23431?: Medium severity. CVSS v3 base score is 5.4 out of 10.