CVE-2020-27387

Name: CVE-2020-27387
Creator: NVD / NIST
Published: 2020-11-05T02:15:12.067+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 18.46%

Last modified Jun 17, 2026

CVE-2020-27387 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 18.46% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

18.46%

96.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions	Update
Horizontcms Project	Horizontcms	1.0.0	Alpha

References

http://packetstormsecurity.com/files/160046/HorizontCMS-1.0.0-beta-Shell-Upload.htmlExploit, Third Party Advisory, VDB Entry
https://blog.vonahi.io/whats-in-a-re-name/Exploit, Patch, Third Party Advisory
https://github.com/rapid7/metasploit-framework/pull/14340Third Party Advisory
https://github.com/ttimot24/HorizontCMS/commit/436b5ab679fd27afa3d99c023dbe103113da4feePatch, Third Party Advisory
http://packetstormsecurity.com/files/160046/HorizontCMS-1.0.0-beta-Shell-Upload.htmlExploit, Third Party Advisory, VDB Entry
https://blog.vonahi.io/whats-in-a-re-name/Exploit, Patch, Third Party Advisory
https://github.com/rapid7/metasploit-framework/pull/14340Third Party Advisory
https://github.com/ttimot24/HorizontCMS/commit/436b5ab679fd27afa3d99c023dbe103113da4feePatch, Third Party Advisory

Timeline

Published: Nov 5, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27387?

How severe is CVE-2020-27387?

CVE-2020-27387 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 18.46% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27387?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27387?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST