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CVE Record

CVE-2020-27386: An unrestricted file upload issue in FlexDotnetCMS before v1.5.9 allows an authenticated remote attacker to...

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>.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

FlexDotnetCMS before v1.5.9 allowed a logged-in attacker to turn an uploaded file into executable code on the website. For an exposed CMS, this can become server-side code execution and site compromise. The public record does not provide CVSS scoring or KEV-confirmed active exploitation. Exposure is most likely on internet-facing FlexDotnetCMS installations before v1.5.9 where authenticated users can access FileManager or FileEditor and uploaded files are reachable by the web server. The source bundle does not provide CPEs, vendor metadata, or deployment prevalence. Treat this as a high-priority legacy CMS risk if FlexDotnetCMS is present. The impact can reach server compromise, but exploitation requires authenticated access. Prioritize version confirmation, access restriction, and upgrade planning over broad emergency response unless local evidence shows abuse. Mitigation focus: Upgrade FlexDotnetCMS to v1.5.9 or later where applicable.; Review the v1.5.9 release guidance before making production changes.; Restrict FileManager and FileEditor access to trusted administrators only..

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Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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File access behavior lookup

The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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CVE-2020-27386 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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