File upload vulnerability in HorizontCMS before 1.0.0-beta.3 via uploading a .htaccess…
Priority MEDIUM 45CWE-434Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-434.
Summary
File upload vulnerability in HorizontCMS before 1.0.0-beta.3 via uploading a .htaccess and *.hello files using the Media Files upload functionality. The original file upload vulnerability (CVE-2020-27387) was remediated by restricting the PHP extensions; however, we confirmed that the filter was bypassed via uploading an arbitrary .htaccess and *.hello files in order to execute PHP code to gain RCE.
Why it matters now
EPSS 0.01243 69th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 11
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:-:*:*:*:*:*:* | 1.0.0 | Vulnerable | Horizontcms Project |
| cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha:*:*:*:*:*:* | 1.0.0 alpha | Vulnerable | Horizontcms Project |
| cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha2:*:*:*:*:*:* | 1.0.0 alpha2 | Vulnerable | Horizontcms Project |
| cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha3:*:*:*:*:*:* | 1.0.0 alpha3 | Vulnerable | Horizontcms Project |
| cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha4:*:*:*:*:*:* | 1.0.0 alpha4 | Vulnerable | Horizontcms Project |
| cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha5:*:*:*:*:*:* | 1.0.0 alpha5 | Vulnerable | Horizontcms Project |
| cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha6:*:*:*:*:*:* | 1.0.0 alpha6 | Vulnerable | Horizontcms Project |
| cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha7:*:*:*:*:*:* | 1.0.0 alpha7 | Vulnerable | Horizontcms Project |
| cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha8:*:*:*:*:*:* | 1.0.0 alpha8 | Vulnerable | Horizontcms Project |
| cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:beta:*:*:*:*:*:* | 1.0.0 beta | Vulnerable | Horizontcms Project |
- cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:-:*:*:*:*:*:* Versions 1.0.0 Vulnerable ·Horizontcms Project
- cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha:*:*:*:*:*:* Versions 1.0.0 alpha Vulnerable ·Horizontcms Project
- cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha2:*:*:*:*:*:* Versions 1.0.0 alpha2 Vulnerable ·Horizontcms Project
- cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha3:*:*:*:*:*:* Versions 1.0.0 alpha3 Vulnerable ·Horizontcms Project
- cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha4:*:*:*:*:*:* Versions 1.0.0 alpha4 Vulnerable ·Horizontcms Project
- cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha5:*:*:*:*:*:* Versions 1.0.0 alpha5 Vulnerable ·Horizontcms Project
- cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha6:*:*:*:*:*:* Versions 1.0.0 alpha6 Vulnerable ·Horizontcms Project
- cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha7:*:*:*:*:*:* Versions 1.0.0 alpha7 Vulnerable ·Horizontcms Project
- cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:alpha8:*:*:*:*:*:* Versions 1.0.0 alpha8 Vulnerable ·Horizontcms Project
- cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:beta:*:*:*:*:*:* Versions 1.0.0 beta Vulnerable ·Horizontcms Project
Show 1 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:beta2:*:*:*:*:*:* | 1.0.0 beta2 | Vulnerable | Horizontcms Project |
- cpe:2.3:a:horizontcms_project:horizontcms:1.0.0:beta2:*:*:*:*:*:* Versions 1.0.0 beta2 Vulnerable ·Horizontcms Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-28428
- 2026-10-03 Alias added: GHSA-cm95-9q8x-72h6
References
More Horizontcms Project Horizontcms vulnerabilities
- TI-2020-16653 An unrestricted file upload issue in HorizontCMS through 1.0.0-beta allows an… CVSS 3.1HIGH 8.8
- TI-2020-17387 An unrestricted file upload issue in HorizontCMS 1.0.0-beta allows an authenticated… CVSS 3.1HIGH 8.8
- TI-2022-08843 HorizontCMS v1.0.0-beta.2 was discovered to contain an arbitrary file download… CVSS 3.1HIGH 7.5
Sources
- CVE-2021-28428 · CVE Program
- CVE-2021-28428 · NVD
- FIRST EPSS
- GHSA-cm95-9q8x-72h6 · GitHub Advisory Database · CC BY 4.0
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