CVE-2021-20654 Cross-site scripting in Wekan
Attackers can inject malicious scripts into Wekan kanban boards, potentially stealing user sessions or executing code in victim browsers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-20654?
CVE-2021-20654 is a medium-severity cross-site scripting vulnerability in Wekan, published on 10 Feb 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2021-20654?
It affects 1 product.
Products include Wekan Project Wekan.
How do I fix CVE-2021-20654?
No fix has been published for CVE-2021-20654 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2021-20654 being exploited?
There is no known exploitation of CVE-2021-20654 in the wild and no public exploit code.
Other vulnerabilities in Wekan
- CVE-2026-30843 Wekan has Cross-Board IDOR in Custom Fields Update Endpoints
- CVE-2026-30844 Wekan Vulnerable to SSRF through Lack of Validation or Filtering in Attachment URL Loading
- CVE-2026-30847 Wekan Credential Leak via notificationUsers Publication Exposes Password Hashes and Session Tokens
- CVE-2025-65780 Missing authorization in n/a
- CVE-2026-30846 Wekan Exposes All Global Webhook Integrations through globalwebhooks Publication
Sources
Also known as GHSA-p4j3-3c38-6j6r.