CVE-2020-28693
An unrestricted file upload issue in HorizontCMS 1.0.0-beta allows an authenticated remote attacker to upload PHP code through a zip file by uploading a theme, and executing the PHP file via an HTTP GET request to /themes/<php_file_name>
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.53%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
An unrestricted file upload issue in HorizontCMS 1.0.0-beta allows an authenticated remote attacker to upload PHP code through a zip file by uploading a theme, and executing the PHP file via an HTTP GET request to /themes/<php_file_name>
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.53% probability · 85th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-434
- Affected
- horizontcms project/horizontcms
- Source
- cve@mitre.org
EPSS 2.5% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/jkana/HorizontCMS-1.0.0-beta-shell-uploadExploit, Third Party Advisory
- https://github.com/ttimot24/HorizontCMS/issues/21Third Party Advisory
- https://github.com/jkana/HorizontCMS-1.0.0-beta-shell-uploadExploit, Third Party Advisory
- https://github.com/ttimot24/HorizontCMS/issues/21Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.