Auth bypass in Wekan
CVE-2026-30847
Wekan is an open source kanban tool built with Meteor. In versions 8.31.0 through 8.33, the notificationUsers publication in Wekan publishes user documents with no field filtering, causing the ReactiveCache.getUsers() call to return all fields including highly sensitive data such as bcrypt password hashes, active session login tokens, email verification tokens, full email addresses, and any stored OAuth tokens. Unlike Meteor's default auto-publication which strips the services field for security, custom publications return whatever fields the cursor contains, meaning all subscribers receive the complete user documents. Any authenticated user who triggers this publication can harvest credentials and active session tokens for other users, enabling password cracking, session hijacking, and full account takeover. This issue has been fixed in version 8.34.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- Wekan — versions >= 8.31.0, < 8.34
- Wekan Project
Weakness classification (CWE)
References
- securitylab.github.com/advisories/GHSL-2026-035_Wekan/ (Third Party Advisory)
- github.com/wekan/wekan/commit/1c8667eae8b28739e43569b612ffdb2693c6b1ce (Patch)
- github.com/wekan/wekan/releases/tag/v8.34 (Release Notes)
Frequently asked questions
- What is CVE-2026-30847?
- CVE-2026-30847 is a medium-severity vulnerability in Wekan, classified under Information Disclosure. CVSS score: 6.5/10. Published 2026-03-06.
- How severe is CVE-2026-30847?
- Medium severity. CVSS v3 base score is 6.5 out of 10.