CVE-2021-4385Network attack vector

Unauthorized group membership changes via missing nonce validation

Published Jul 1, 2023 · Updated Apr 8, 2026

CSRF in WP Expert Developer WP Private Content Plus 3.1 and earlier allows remote attackers to add group members via forged requests. The save_groups() function accepts state-changing requests without correctly validating a WordPress nonce. Exploitation requires an administrator to submit an attacker-controlled request, and the bounded impact is unauthorized group-membership modification.

CVSS severity4.3
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in WP Expert Developer WP Private Content Plus 3.1 and earlier allows remote attackers to add group members via forged requests. The save_groups() function accepts state-changing requests without correctly validating a WordPress nonce. Exploitation requires an administrator to submit an attacker-controlled request, and the bounded impact is unauthorized group-membership modification.

The record

CVE
CVE-2021-4385
Published
Jul 1, 2023
Updated
Apr 8, 2026
Vendor
WP Expert Developer
Product
WP Private Content Plus
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 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 <=3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WP Expert Developer · WP Private Content Plusversion=0 <=3.1

Published CVSS scores

4.3WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001User Execution: Malicious Link

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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