Cross-site scripting vulnerability in file upload
Priority LOW 39CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
baserCMS is an open source content management system with a focus on Japanese language support. In affected versions there is a cross-site scripting vulnerability in the file upload function of the management system of baserCMS. Users are advised to update as soon as possible. No workaround are available to mitigate this issue.
Why it matters now
EPSS 0.00929 60th percentileScored 2026-11-07
Fix Fixed basercms (baserproject): 4.5.1baserproject/basercms (Packagist): 4.5.1
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 4.5.1 | 4.5.1 | Patch available | CNA |
| — | baserproject/basercms (Packagist) | before 4.5.1 | 4.5.1 | Patch available | GHSA-hgjr-632x-qpp3 |
- basercms Vendorbaserproject Affected before 4.5.1 Fixed in 4.5.1 Patch available CNA
- baserproject/basercms (Packagist) Vendor— Affected before 4.5.1 Fixed in 4.5.1 Patch available GHSA-hgjr-632x-qpp3
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:basercms:basercms:*:*:*:*:*:*:*:* | before 4.5.1 | Vulnerable | baserproject |
- cpe:2.3:a:basercms:basercms:*:*:*:*:*:*:*:* Versions before 4.5.1 Vulnerable ·baserproject
Remediation
- Fix · CNA basercms (baserproject) Fixed in 4.5.1
- Fix · GHSA-hgjr-632x-qpp3 baserproject/basercms (Packagist) Fixed in 4.5.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-39136
- 2026-10-03 Alias added: GHSA-hgjr-632x-qpp3
References
Advisory 4
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-2021-39136 · CVE Program
- CVE-2021-39136 · NVD
- FIRST EPSS
- GHSA-hgjr-632x-qpp3 · GitHub Advisory Database · CC BY 4.0
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