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Vulnerability record · CVE-2020-27385 · published 12 November 2020

CVE-2020-27385: Flexdotnetcms project flexdotnetcms path traversal vulnerability

FFlexdotnetcms Project · Flexdotnetcms

Incorrect Access Control in the FileEditor (/Admin/Views/FileEditor/) in FlexDotnetCMS before v1.5.11 allows an authenticated remote attacker to read and write to existing files outside the web root. The files can be accessed via directory traversal, i.e., by entering a .. (dot dot) path such as ..\..\..\..\..\<file> in the input field of the FileEditor. In FlexDotnetCMS before v1.5.8, it is also possible to access files by specifying the full path (e.g., C:\<file>). The files can then be edited via the FileEditor.

8.1 CVSS 3.1 High EPSS 1.8% · top 22.8% CWE-22 · Path traversal
8.1CVSS 3.1 base score, v2 5.5
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Incorrect Access Control in the FileEditor (/Admin/Views/FileEditor/) in FlexDotnetCMS before v1.5.11 allows an authenticated remote attacker to read and write to existing files outside the web root. The files can be accessed via directory traversal, i.e., by entering a .. (dot dot) path such as ..\..\..\..\..\<file> in the input field of the FileEditor. In FlexDotnetCMS before v1.5.8, it is also possible to access files by specifying the full path (e.g., C:\<file>). The files can then be edited via the FileEditor.

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

Affected products

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

References

LinkTags
https://blog.vonahi.io/whats-in-a-re-name/ ExploitThird Party Advisory
https://github.com/MacdonaldRobinson/FlexDotnetCMS/releases/tag/v1.5.11 Release NotesThird Party Advisory
https://blog.vonahi.io/whats-in-a-re-name/ ExploitThird Party Advisory
https://github.com/MacdonaldRobinson/FlexDotnetCMS/releases/tag/v1.5.11 Release NotesThird 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-2020-27385), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.