CVE-2020-13241Public exploit

Authenticated dangerous-file upload via unchecked image extension

Published May 20, 2020 · Updated Aug 4, 2024

Unrestricted file upload in Microweber 1.1.18 allows local users to place dangerous files through the Edit User image control. The users edit route accepts the Add Image filename without verifying that its extension belongs to an image type, so a disguised PHP web shell passes the upload control. An authenticated Microweber session and access to the Edit User screen are required; a successful upload can place a web shell on the server and grant file-system access.

CVSS severity7.8
High
EPSS probability0.46%
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 Microweber 1.1.18 allows local users to place dangerous files through the Edit User image control. The users edit route accepts the Add Image filename without verifying that its extension belongs to an image type, so a disguised PHP web shell passes the upload control. An authenticated Microweber session and access to the Edit User screen are required; a successful upload can place a web shell on the server and grant file-system access.

The record

CVE
CVE-2020-13241
Published
May 20, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1505.003
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C
7.8GitHub Advisory DatabaseCVSS:3.1/AV:L/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)
Vectorlocal
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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