CVE-2026-30843 Wekan has Cross-Board IDOR in Custom Fields Update Endpoints
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-30843?
CVE-2026-30843 is a critical vulnerability in Wekan, published on 6 Mar 2026.
Official description
Wekan is an open source kanban tool built with Meteor. Versions 8.32 and 8.33 have a critical Insecure Direct Object Reference (IDOR) issue which could allow unauthorized users to modify custom fields across boards through its custom fields update endpoints, potentially leading to unauthorized data manipulation. The PUT /api/boards/:boardId/custom-fields/:customFieldId endpoint in Wekan validates that the authenticated user has access to the specified boardId, but the subsequent database update uses only the custom field's _id as a filter without confirming the field actually belongs to that board. This means an attacker who owns any board can modify custom fields on any other board by supplying a foreign custom field ID, and the same flaw exists in the POST, PUT, and DELETE endpoints for dropdown items under custom fields. The required custom field IDs can be obtained by exporting a board (which only needs read access), since the exported JSON includes the IDs of all board components. The authorization check is performed against the wrong resource, allowing cross-board custom field manipulation. This issue has been fixed in version 8.34.
Weakness: CWE-639
Which versions are affected by CVE-2026-30843?
It affects 1 product.
Products include Wekan Project Wekan.
How do I fix CVE-2026-30843?
No fix has been published for CVE-2026-30843 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-30843 being exploited?
There is no known exploitation of CVE-2026-30843 in the wild and no public exploit code.
Other vulnerabilities in Wekan
- 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
- CVE-2026-25560 WeKan < 8.19 LDAP Authentication Filter Injection