Zip Slip Vulnerability in BaserCMS
Priority MEDIUM 41CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
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.
Why it matters now
EPSS 0.01616 76th percentileScored 2026-11-07
Fix Fixed basercms (baserproject): 4.5.3baserproject/basercms (Packagist): 4.5.4
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| baserproject | basercms | before 4.5.3 | 4.5.3 | Patch available | CNA |
| — | baserproject/basercms (Packagist) | before 4.5.4 | 4.5.4 | Patch available | GHSA-4x2f-54wr-4hjg |
- basercms Vendorbaserproject Affected before 4.5.3 Fixed in 4.5.3 Patch available CNA
- baserproject/basercms (Packagist) Vendor— Affected before 4.5.4 Fixed in 4.5.4 Patch available GHSA-4x2f-54wr-4hjg
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:basercms:basercms:*:*:*:*:*:*:*:* | before 4.5.4 | Vulnerable | baserproject |
- cpe:2.3:a:basercms:basercms:*:*:*:*:*:*:*:* Versions before 4.5.4 Vulnerable ·baserproject
Remediation
- Fix · CNA basercms (baserproject) Fixed in 4.5.3
- Fix · GHSA-4x2f-54wr-4hjg baserproject/basercms (Packagist) Fixed in 4.5.4 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-41279
- 2026-10-03 Alias added: GHSA-4x2f-54wr-4hjg
References
More baserproject Basercms vulnerabilities
- TI-2026-17563 baserCMS: OS Command Injection Leading to Remote Code Execution (RCE) CVSS 3.1CRITICAL 9.1
- TI-2025-23967 baserCMS: unsafe File Upload Leading to Remote Code Execution (RCE) CVSS 3.1HIGH 8.7
- TI-2026-23707 baserCMS: Mail Form Acceptance Bypass via Public API CVSS 3.1MEDIUM 5.3
- TI-2023-10935 baserCMS File Uploader Remote Code Execution (RCE) vulnerability CVSS 3.1CRITICAL 9.8
- TI-2023-10936 baserCMS allows any file to be uploaded CVSS 3.1CRITICAL 9.8
- TI-2023-23483 baserCMS Code Injection Vulnerability in Mail Form Feature CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-41279 · CVE Program
- CVE-2021-41279 · NVD
- FIRST EPSS
- GHSA-4x2f-54wr-4hjg · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences