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User Registration Membership CVE-2023-27459

HIGH
Deserialization of Untrusted Data (CWE-502)
2024-03-26 audit@patchstack.com
Deserialization User Registration Membership Wpeverest
7.4
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-502
OWASP Top 10:2025
A08:2025 - Software or Data Integrity Failures
ASVS 5.0
V1 - Encoding and Sanitization Safe deserialization, type allowlists
MITRE ATT&CK

2 techniques across 2 tactics: Execution, Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 7.4 (HIGH). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required. EPSS exploitation probability: 0.43%.
Exploit ScenarioDerived

A remote attacker could execute arbitrary code through malicious serialized objects by sending crafted requests to the affected application.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.4% exploitation probability (EPSS)

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AnalysisAI

Deserialization of Untrusted Data vulnerability in WPEverest User Registration.3.2.1. Rated high severity (CVSS 7.4), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Avoid deserializing untrusted data. Use safe serialization formats (JSON). Implement integrity checks and type allowlists.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified as Deserialization of Untrusted Data (CWE-502), which allows attackers to execute arbitrary code through malicious serialized objects. Deserialization of Untrusted Data vulnerability in WPEverest User Registration.3.2.1. Affected products include: Wpeverest User Registration \& Membership. Version information: through 2.3.2.1..

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 7.4 HIGH
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

DescriptionCVE.org

Deserialization of Untrusted Data vulnerability in WPEverest User Registration.This issue affects User Registration: from n/a through 2.3.2.1.

Threat Intelligence Overview

EPSS Score
0.4%
Top 37% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.4%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

37
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +37
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Insecure Deserialization CRITICAL

Insecure deserialization occurs when an application converts serialized data (a stream of bytes representing an object's state) back into a living object without proper validation.

Affected Products (CPE)CVE.org

cpe:2.3:a:wpeverest:user_registration_\&_membership:*:*:*:*:free:wordpress:*:*

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8.1 Apr 14

The User Registration & Membership WordPress plugin before version 4.1.2 fails to prevent users from setting their accou
CVE-2025-2594 HIGH POC
8.1 Apr 22

The User Registration & Membership WordPress plugin before 4.1.3 does not properly validate data in an AJAX action when

CVE-2026-11964 CRITICAL POC
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Payment-verification bypass in the User Registration & Membership WordPress plugin before 5.2.2 lets unauthenticated att
CVE-2026-11961 HIGH POC
8.1 Jul 17

Privilege escalation in the User Registration & Membership WordPress plugin before 5.2.3 lets unauthenticated visitors s
CVE-2026-11963 HIGH POC
8.1 Jul 13

Privilege escalation in the User Registration & Membership WordPress plugin before 5.2.2 lets any authenticated low-priv
CVE-2026-86406 HIGH POC
7.5 Sep 13

Privilege escalation in the User Registration & Membership WordPress plugin (versions 4.4.6 through pre-5.2.8) allows an
CVE-2026-16736 HIGH POC
7.5 Aug 05

Registration enforcement bypass in the User Registration & Membership WordPress plugin (all versions before 5.2.6) allow
CVE-2026-80071 HIGH POC
7.2 Sep 13

Privilege escalation in the User Registration & Membership WordPress plugin before 5.2.8 allows any authenticated user h
CVE-2026-79996 HIGH POC
7.2 Aug 28

Privilege escalation in the User Registration & Membership WordPress plugin before 5.2.6 lets authenticated users holdin
CVE-2026-11966 MEDIUM POC
5.3 Jul 17

Unauthenticated account deletion in the User Registration & Membership WordPress plugin (all versions before 5.2.3) expo
CVE-2026-80072 MEDIUM POC
4.7 Sep 13

Open redirect in the User Registration & Membership WordPress plugin before 5.2.8 permits unauthenticated attackers to c
CVE-2026-79995 MEDIUM POC
4.3 Aug 28

Missing object-level authorization in the User Registration & Membership WordPress plugin (before 5.2.5) allows any auth

Same weakness CWE-502 – Deserialization of Untrusted Data

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CVE-2020-7961 CRITICAL POC
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CVE-2025-24016 CRITICAL POC
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Same technique Deserialization

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References

Advisories & patches
REF https://patchstack.com/database/vulnerability/user-registration/wordpress-user-registration-plugin-2-3-2-1-authenticated-php-object-injection-vulnerability?_s_id=cve

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