CVE-2020-37227Public exploitNetwork attack vector

Authenticated code execution via client-side upload validation

Published May 16, 2026 · Updated May 16, 2026

Unrestricted file upload in HS Brand Logo Slider 2.1 allows remote authenticated users to execute code through a crafted logo upload. The plugin's admin.php page relies on client-side extension validation for the logoupload filename, so an intercepted multipart request can replace an image extension with .php. An authenticated WordPress account with access to the plugin's administrative upload interface is required, and execution occurs when the web server serves the uploaded PHP shell.

CVSS severity8.7
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in HS Brand Logo Slider 2.1 allows remote authenticated users to execute code through a crafted logo upload. The plugin's admin.php page relies on client-side extension validation for the logoupload filename, so an intercepted multipart request can replace an image extension with .php. An authenticated WordPress account with access to the plugin's administrative upload interface is required, and execution occurs when the web server serves the uploaded PHP shell.

The record

CVE
CVE-2020-37227
Published
May 16, 2026
Updated
May 16, 2026
Vendor
Helios Solutions
Product
HS Brand Logo Slider
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 16, 2026CVE publishedPublication date reported by the CVE source.
  2. May 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Helios Solutions · HS Brand Logo Sliderversion=2.1

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component: Web Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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