Description
An issue was discovered in Wekan The Open Source kanban board system up to version 18.15, fixed in 18.16. Uploaded attachments can be served with attacker-controlled Content-Type (text/html), allowing execution of attacker-supplied HTML/JS in the application's origin and enabling session/token theft and CSRF actions.
Affected products
wekan_project: wekan
References4
- wekan.fi/hall-of-fame/spacebleed/ Vendor Advisory
- github.com/wekan/wekan/commit/e9a727301d7b4f1689a703503df668c0f… Patch
- github.com/wekan/wekan Product
- github.com/wekan/wekan/blob/main/CHANGELOG.md#v816-2025-11-02-w… Release Notes
Metrics
- CVSS 3.1
-
8.1
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N - EPSS — exploit probability
- 0% percentile: 32 · as of 11 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.