Auth bypass in Wekan
CVE-2026-25561
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Wekan — versions 0
- Wekan Project
Weakness classification (CWE)
References
- github.com/wekan/wekan/commit/1d16955b6d4f0a0282e89c2c1b0415c7597019b8 (Patch, patch)
- wekan.fi/ (Product, product)
- www.vulncheck.com/advisories/wekan-attachment-upload-object-relationship-valida… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-25561?
- CVE-2026-25561 is a high-severity vulnerability in Wekan, classified under Incorrect Authorization. CVSS score: 7.5/10. Published 2026-02-07.
- How severe is CVE-2026-25561?
- High severity. CVSS v3 base score is 7.5 out of 10.