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.
The notificationUsers publication in Wekan calls ReactiveCache.getUsers() without applying field filtering in the MongoDB cursor, causing subscribers to receive complete user documents. Unlike Meteor's default auto-publication, which automatically removes the services field for security reasons, custom publications return all fields without restrictions. Every logged-in user activating this publication gains access to other users' data, including bcrypt password hashes, active login session tokens, email verification tokens, full email addresses, and OAuth tokens.
An attacker with an application account can download password hashes of all users (enabling offline cracking), intercept active session tokens and perform session hijacking, and consequently gain full control over any account in the system.
Wekan should be updated to version 8.34, where the issue has been fixed. The fix is available in the GitHub repository (commit 1c8667eae8b28739e43569b612ffdb2693c6b1ce) and in the v8.34 release.
Wekan in versions 8.31.0, 8.32.x, and 8.33.x (Wekan Project Wekan)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XWekan Project Wekan
APPWekan Project8.31 – 8.33 (excl.)
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