CVE-2021-4374Known exploitationPublic exploitNetwork attack vector

Site takeover via unauthenticated option writes

Published Jun 7, 2023 · Updated Apr 8, 2026

Missing authorization in ValvePress WordPress Automatic Plugin before 3.53.3 allows remote attackers to overwrite WordPress options. The public process_form.php endpoint accepts attacker-chosen option names and values and writes them without authorization or option validation. No account or user interaction is required; changing registration and default-role settings enables creation of an Administrator account and full site control.

CVSS severity9.8
Critical
EPSS probability16.41%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in ValvePress WordPress Automatic Plugin before 3.53.3 allows remote attackers to overwrite WordPress options. The public process_form.php endpoint accepts attacker-chosen option names and values and writes them without authorization or option validation. No account or user interaction is required; changing registration and default-role settings enables creation of an Administrator account and full site control.

The record

CVE
CVE-2021-4374
Published
Jun 7, 2023
Updated
Apr 8, 2026
Vendor
ValvePress
Product
WordPress Automatic Plugin
Classifications
CWE-862, T1098
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record 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=0 <3.53.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ValvePress · WordPress Automatic Pluginversion=0 <3.53.3

Published CVSS scores

9.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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.

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

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
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1098Account Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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