What is the CVSS score of CVE-2023-2734?

CVE-2023-2734 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 60.3%.

Is there a public PoC exploit available for CVE-2023-2734?

Yes, a public proof-of-concept exploit is available for CVE-2023-2734. Prioritise patching immediately. EPSS: 60.3%.

Is there a patch available for CVE-2023-2734?

Yes, a patch is available for CVE-2023-2734. Update the affected software to the latest version immediately.

Mstore Api CVE-2023-2734

CRITICAL

Authentication Bypass Using an Alternate Path or Channel (CWE-288)

2023-05-25 security@wordfence.com

WordPress Authentication Bypass Mstore Api Wordpress Plugin Inspireui

9.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-288 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication Alternate path authentication
Impact	CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 60.34%.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

Patch available 60.3% exploitation probability (EPSS)

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AnalysisAI

The MStore API plugin for WordPress is vulnerable to authentication bypass in versions up to, and including, 3.9.1. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 60.3%.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-288. The MStore API plugin for WordPress is vulnerable to authentication bypass in versions up to, and including, 3.9.1. This is due to insufficient verification on the user being supplied during the cart sync from mobile REST API request through the plugin. This makes it possible for unauthenticated attackers to log in as any existing user on the site, such as an administrator, if they have access to the user id. Affected products include: Inspireui Mstore Api.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Apr 08, 2026 - 18:22 nvd

Patch available

CVE Published

May 25, 2023 - 03:15 nvd

CRITICAL 9.8

DescriptionCVE.org

The MStore API plugin for WordPress is vulnerable to authentication bypass in versions up to, and including, 3.9.1. This is due to insufficient verification on the user being supplied during the cart sync from mobile REST API request through the plugin. This makes it possible for unauthenticated attackers to log in as any existing user on the site, such as an administrator, if they have access to the user id.

Threat Intelligence Overview

Threat Score

5.3/10

Composite threat intelligence

EPSS Score

60.3%

Top 2% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS POC (1)

VulDB

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 CRITICAL

CISA KEV No

Public POC Yes

EPSS 60.3%

Patch available Yes

Active threat Yes

Deciding rule

CRITICAL severity + public POC available

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

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

129

Low Medium High Critical

KEV: 0

EPSS: +60

CVSS: +49

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:a:inspireui:mstore_api:*:*:*:*:*:wordpress:*:*

More in Mstore Api

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9.8 May 25

The MStore API plugin for WordPress is vulnerable to authentication bypass in versions up to, and including, 3.9.2. Rate

CVE-2023-3277 CRITICAL Emergency POC

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The MStore API plugin for WordPress is vulnerable to Unauthorized Account Access and Privilege Escalation in versions up

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The MStore API plugin for WordPress is vulnerable to Unauthenticated Blind SQL Injection via the 'id' parameter in versi

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The MStore API plugin for WordPress is vulnerable to authentication bypass in versions up to, and including, 2.1.5. Rate

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The MStore API WordPress plugin before 3.9.8 does not sanitise and escape a parameter before using it in a SQL statement

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The MStore API WordPress plugin before 3.9.9 does not prevent visitors from creating user accounts with the role of thei

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9.3 May 10

WordPress MStore API 2.0.6 contains an arbitrary file upload vulnerability that allows unauthenticated attackers to uplo

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CVE-2026-16030 HIGH This Week POC

8.1 Aug 07

Account takeover in MStore API WordPress plugin before 4.21.0 is achievable by unauthenticated remote attackers who know

CVE-2026-16041 HIGH This Week POC

7.5 Aug 07

Integrity bypass in MStore API WordPress plugin (versions before 4.21.0) enables unauthenticated remote attackers to cre

CVE-2026-18234 MEDIUM This Month POC

6.5 Aug 29

Broken order authorization in MStore API WordPress plugin (before 4.21.1) allows any authenticated user, including low-p

CVE-2026-18233 MEDIUM This Month POC

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MStore API WordPress plugin before 4.21.1 allows any authenticated user - including the lowest-privilege Subscriber role

Same weakness CWE-288 – Authentication Bypass Using an Alternate Path or Channel

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CVE-2025-4427 MEDIUM POC

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CVE-2025-34026 CRITICAL POC

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CVE-2026-23760 CRITICAL POC

9.3

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CVE-2011-3544 CRITICAL POC

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CVE-2022-40684 CRITICAL POC

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CVE-2025-61882 CRITICAL POC

9.8

CVE-2024-0012 CRITICAL POC

9.3

References

Advisories & patches

PATCH https://plugins.trac.wordpress.org/browser/mstore-api/tags/3.9.0/controllers/flutter-woo.php#L911 PATCH https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=2915729%40mstore-api&old=2913397%40mstore-api&sfp_email=&sfph_mail=#file59 ADVISORY https://vuldb.com/vuln/229848 REF https://www.wordfence.com/threat-intel/vulnerabilities/id/5881d16c-84e8-4610-8233-cfa5a94fe3f9?source=cve

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