What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-26 · updated 2026-06-17
• Weakness: CWE-78

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.

Affected products

• baserproject basercms: before 4.5.4 — fixed in 4.5.4

How to fix

Upgrade to a fixed version: baserproject basercms 4.5.4. Check the vendor advisory for mitigations.

References

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

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