CVE-2020-18121Public exploitNetwork attack vector

Authenticated code execution via editable PHP plugins

Published Aug 30, 2021 · Updated Aug 4, 2024

Improper access control in Indexhibit 2.1.5 allows remote authenticated users to execute arbitrary code by modifying PHP plugin files. The authenticated Assets interface permits plugin editing, including PHP files, without preventing server-side executable content changes. Any account with access to that interface can replace plugin code and execute commands with the web server's privileges.

CVSS severity8.8
High
EPSS probability0.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Indexhibit 2.1.5 allows remote authenticated users to execute arbitrary code by modifying PHP plugin files. The authenticated Assets interface permits plugin editing, including PHP files, without preventing server-side executable content changes. Any account with access to that interface can replace plugin code and execute commands with the web server's privileges.

The record

CVE
CVE-2020-18121
Published
Aug 30, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-732, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 30, 2021CVE 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 vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
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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