CVE-2020-22539Public exploitNetwork attack vector

Administrator code execution via category icon upload

Published Apr 15, 2024 · Updated Aug 22, 2024

Unrestricted file upload in Codoforum 4.9 allows remote authenticated users to execute arbitrary code through a crafted category icon. The Add Category icon handler accepts a PHP shell as an image and leaves it reachable through the category icon URL. Administrator access is required; requesting the uploaded icon executes the file with the web server process privileges and exposes accessible data.

CVSS severity7.2
High
EPSS probability0.86%
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 Codoforum 4.9 allows remote authenticated users to execute arbitrary code through a crafted category icon. The Add Category icon handler accepts a PHP shell as an image and leaves it reachable through the category icon URL. Administrator access is required; requesting the uploaded icon executes the file with the web server process privileges and exposes accessible data.

The record

CVE
CVE-2020-22539
Published
Apr 15, 2024
Updated
Aug 22, 2024
Vendor
Codologic Pvt. Ltd.
Product
Codoforum
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 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?

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

  1. Affected versionversion=4.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Codologic Pvt. Ltd. · Codoforumversion=4.9

Published CVSS scores

7.2CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesadmin
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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