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Vulnerability record · CVE-2020-27387 · published 5 November 2020

CVE-2020-27387: Horizontcms project horizontcms unrestricted file upload vulnerability

HHorizontcms Project · Horizontcms

An unrestricted file upload issue in HorizontCMS through 1.0.0-beta allows an authenticated remote attacker (with access to the FileManager) to upload and execute arbitrary PHP code by uploading a PHP payload, and then using the FileManager's rename function to provide the payload (which will receive a random name on the server) with the PHP extension, and finally executing the PHP file via an HTTP GET request to /storage/<php_file_name>. NOTE: the vendor has patched this while leaving the version number at 1.0.0-beta.

8.8 CVSS 3.1 High EPSS 18% · top 2.8% CWE-434 · Unrestricted file upload
8.8CVSS 3.1 base score, v2 6.5
18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

An unrestricted file upload issue in HorizontCMS through 1.0.0-beta allows an authenticated remote attacker (with access to the FileManager) to upload and execute arbitrary PHP code by uploading a PHP payload, and then using the FileManager's rename function to provide the payload (which will receive a random name on the server) with the PHP extension, and finally executing the PHP file via an HTTP GET request to /storage/<php_file_name>. NOTE: the vendor has patched this while leaving the version number at 1.0.0-beta.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/160046/HorizontCMS-1.0.0-beta-Shell-Upload.html ExploitThird Party AdvisoryVDB Entry
https://blog.vonahi.io/whats-in-a-re-name/ ExploitPatchThird Party Advisory
https://github.com/rapid7/metasploit-framework/pull/14340 Third Party Advisory
https://github.com/ttimot24/HorizontCMS/commit/436b5ab679fd27afa3d99c023dbe103113da4fee PatchThird Party Advisory
http://packetstormsecurity.com/files/160046/HorizontCMS-1.0.0-beta-Shell-Upload.html ExploitThird Party AdvisoryVDB Entry
https://blog.vonahi.io/whats-in-a-re-name/ ExploitPatchThird Party Advisory
https://github.com/rapid7/metasploit-framework/pull/14340 Third Party Advisory
https://github.com/ttimot24/HorizontCMS/commit/436b5ab679fd27afa3d99c023dbe103113da4fee PatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-27387), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.