CVE-2021-24279Network attack vector

Subscriber-level plugin installation via unchecked AJAX import

Published May 14, 2021 · Updated Aug 3, 2024

Incorrect authorization in Redirection for Contact Form 7 before 2.3.4 allows remote authenticated users to install repository plugins. The import_from_debug AJAX handler accepts attacker-controlled debug data and invokes install_plugins without a capability check or nonce validation. Subscriber-level access is sufficient to add attacker-selected WordPress repository code to the site, altering its executable plugin set.

CVSS severity6.5
Medium
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Redirection for Contact Form 7 before 2.3.4 allows remote authenticated users to install repository plugins. The import_from_debug AJAX handler accepts attacker-controlled debug data and invokes install_plugins without a capability check or nonce validation. Subscriber-level access is sufficient to add attacker-selected WordPress repository code to the site, altering its executable plugin set.

The record

CVE
CVE-2021-24279
Published
May 14, 2021
Updated
Aug 3, 2024
Vendor
Query Solutions Ltd.
Product
Redirection for Contact Form 7
Classifications
CWE-863, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 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=2.3.4 <2.3.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Query Solutions Ltd. · Redirection for Contact Form 7version=2.3.4 <2.3.4

Published CVSS scores

5.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:P/A:N

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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