CVE-2026-25561 WeKan < 8.19 Attachment Upload Object Relationship Validation Bypass
Attackers can upload attachments to mismatched board or card relationships due to insufficient validation in the WeKan attachment API.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-25561?
CVE-2026-25561 is a high-severity missing authorization vulnerability in WeKan, published on 7 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
WeKan versions prior to 8.19 contain an authorization weakness in the attachment upload API. The API does not fully validate that provided identifiers (such as boardId, cardId, swimlaneId, and listId) are consistent and refer to a coherent card/board relationship, enabling attempts to upload attachments with mismatched object relationships.
Weakness: CWE-863
Which versions are affected by CVE-2026-25561?
It affects 1 product.
Products include Wekan Project Wekan.
How do I fix CVE-2026-25561?
No fix has been published for CVE-2026-25561 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-25561 being exploited?
There is no known exploitation of CVE-2026-25561 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-5q4r-452w-ggwq.