CVE-2026-27543
Deferred Deferred - Pending Action

Unauthenticated Privilege Escalation in MStore API

Publication date: 2026-08-13

Last updated on: 2026-08-13

Assigner: Patchstack

Description
Unauthenticated Privilege Escalation in MStore API <= 4.20.0 versions.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-08-13
Last Modified
2026-08-13
Generated
2026-09-03
AI Q&A
2026-08-13
EPSS Evaluated
2026-09-01
NVD
CVE-2026-27543
EUVD
EUVD-2026-57938

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
patchstack mstore_api to 4.20.0 (inc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-266 A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is an unauthenticated privilege escalation in the MStore API WordPress plugin versions 4.20.0 and below. It allows attackers to escalate low-privilege accounts to higher levels without authentication, potentially gaining full control of the website.

Detection Guidance

Check if the MStore API plugin version is 4.20.0 or below by inspecting the WordPress admin panel or via command line. Use commands like 'wp plugin list' in WordPress CLI or check the plugin directory for version files.

Impact Analysis

Unauthenticated attackers could exploit this to take full control of your website, modify content, steal data, or install malicious software. The high CVSS score of 8.1 indicates a severe risk requiring immediate action.

Compliance Impact

This vulnerability could lead to unauthorized access and control of a website, potentially exposing sensitive user data. For GDPR, this may result in violations of data protection principles, unauthorized processing, or breaches requiring notification under Article 33. For HIPAA, it could compromise protected health information integrity or confidentiality, leading to compliance failures and penalties.

Mitigation Strategies

Update the MStore API plugin to version 4.21.0 or later immediately. Apply the Patchstack mitigation rule if an update is not possible right away to block attacks until patched.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-27543. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart