What’s Vulnerable › Vulnerabilities

CVE-2021-41279: Zip Slip Vulnerability in BaserCMS

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% 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-22

Description

BaserCMS is an open source content management system with a focus on Japanese language support. In affected versions users with upload privilege may upload crafted zip files capable of path traversal 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/d8ab0a81a7bce35cc95ff7dff851a7e87a084336
• https://github.com/baserproject/basercms/security/advisories/GHSA-4x2f-54wr-4hjg
• https://github.com/baserproject/basercms/commit/d8ab0a81a7bce35cc95ff7dff851a7e87a084336
• https://github.com/baserproject/basercms/security/advisories/GHSA-4x2f-54wr-4hjg

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