What is CVE-2021-20654?

CVE-2021-20654 is a medium-severity vulnerability in Wekan Project, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-02-10.

How severe is CVE-2021-20654?

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

XSS in Wekan Project

CVE-2021-20654

Wekan, open source kanban board system, between version 3.12 and 4.11, is vulnerable to multiple stored cross-site scripting. This is named 'Fieldbleed' in the vendor's site.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-02-10 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.008 (53.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Wekan Project
Wekan Team — versions versions between 3.12 and 4.11

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

wekan.github.io/hall-of-fame/fieldbleed/ (Exploit, Third Party Advisory)
jvn.jp/en/jp/JVN80785288/ (Third Party Advisory)

Frequently asked questions

What is CVE-2021-20654?: CVE-2021-20654 is a medium-severity vulnerability in Wekan Project, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-02-10.
How severe is CVE-2021-20654?: Medium severity. CVSS v3 base score is 5.4 out of 10.