Inefficient regular expression complexity in Wekan - #VU145035
Published: August 25, 2026
Vulnerability identifier: #VU145035
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-1333
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to inefficient regular expression complexity in the user-search publication and searchUsers Meteor method when processing user-supplied search queries. A remote user can send a crafted search query containing catastrophic-backtracking regular expressions to cause a denial of service.
Only deployments using an external MongoDB backend are practically affected; deployments using the bundled FerretDB v1 SQLite backend are not practically exploitable. The searchUsers method additionally requires active board membership or site-admin status, while the user-search publication requires only a logged-in session.
Affected software
Wekan
Remediation
Install security update from vendor's website.
Wekan - update to 11.11