CVE-2021-24354Public exploitNetwork attack vector

Arbitrary plugin installation via unchecked AJAX handler

Published Jun 14, 2021 · Updated Aug 3, 2024

Missing authorization in WPDeveloper Simple 301 Redirects 2.0.0 through 2.0.3 allows remote authenticated users to install plugins. The install_plugin AJAX handler accepts an attacker-chosen repository slug without a capability check, while its wp_rest nonce is obtainable by any authenticated user. Subscriber-level access is sufficient to add arbitrary WordPress repository code to the site, enabling further compromise if a suitable plugin is available.

CVSS severity8.8
High
EPSS probability1.48%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in WPDeveloper Simple 301 Redirects 2.0.0 through 2.0.3 allows remote authenticated users to install plugins. The install_plugin AJAX handler accepts an attacker-chosen repository slug without a capability check, while its wp_rest nonce is obtainable by any authenticated user. Subscriber-level access is sufficient to add arbitrary WordPress repository code to the site, enabling further compromise if a suitable plugin is available.

The record

CVE
CVE-2021-24354
Published
Jun 14, 2021
Updated
Aug 3, 2024
Vendor
WPDeveloper
Product
Simple 301 Redirects
Classifications
CWE-862, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=2.0.0 <2.0.0*
  2. Affected versionversion=2.0.4 <2.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WPDeveloper · Simple 301 Redirectsversion=2.0.0 <2.0.0*; version=2.0.4 <2.0.4

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
7.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-862Missing Authorization
T1190Exploit Public-Facing Application

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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