---
title: "CVE-2020-27386: An unrestricted file upload issue… | CubePath"
description: "An unrestricted file upload issue in FlexDotnetCMS before v1.5.9 allows an authenticated remote attacker to upload and execute arbitrary files by using…"
language: en
source: https://cubepath.com/security/cve/CVE-2020-27386
---

# CVE-2020-27386: An unrestricted file upload issue… | CubePath

## Description

An unrestricted file upload issue in FlexDotnetCMS before v1.5.9 allows an authenticated remote attacker to upload and execute arbitrary files by using the FileManager to upload malicious code (e.g., ASP code) in the form of a safe file type (e.g., a TXT file), and then using the FileEditor (in v1.5.8 and prior) or the FileManager's rename function (in v1.5.7 and prior) to rename the file to an executable extension (e.g., ASP), and finally executing the file via an HTTP GET request to /<path\_to\_file>.

Official description from the CVE record, published by mitre. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-27386)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.71571 (71.6% probability)

Percentile

99.4%

Scores of

Nov 10, 2026

Model

v2026.06.15

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [github.com/MacdonaldRobinson/FlexDotnetCMS/releases/tag/v1.…](https://github.com/MacdonaldRobinson/FlexDotnetCMS/releases/tag/v1.5.9)
- [blog.vonahi.io/whats-in-a-re-name](https://blog.vonahi.io/whats-in-a-re-name/)
- [github.com/rapid7/metasploit-framework/pull/14339](https://github.com/rapid7/metasploit-framework/pull/14339)
- [packetstormsecurity.com/files/160411/FlexDotnetCMS-1.5.8-Ar…](http://packetstormsecurity.com/files/160411/FlexDotnetCMS-1.5.8-Arbitrary-ASP-File-Upload.html)

## Timeline

1. ID reserved Oct 21, 2020
2. Record published Nov 12, 2020
3. Record last updated Aug 4, 2024

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:04 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)