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TI-2020-16652 Aliases CVE-2020-27386GHSA-j66w-g54r-w535

An unrestricted file upload issue in FlexDotnetCMS before v1.5.9 allows an authenticated…

Priority HIGH 76CWE-434Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
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

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>.

Why it matters now

EPSS 0.71571 99th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
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

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:flexdotnetcms_project:flexdotnetcms:*:*:*:*:*:*:*:*before 1.5.9VulnerableFlexdotnetcms Project
  • cpe:2.3:a:flexdotnetcms_project:flexdotnetcms:*:*:*:*:*:*:*:* Versions before 1.5.9 Vulnerable ·Flexdotnetcms Project

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-27386
  2. 2026-10-03 Alias added: GHSA-j66w-g54r-w535

References

Exploit 2

Advisory 2

  • TI-2020-16651 Incorrect Access Control in the FileEditor (/Admin/Views/FileEditor/) in FlexDotnetCMS… CVSS 3.1HIGH 8.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences