CVE-2026-88828
Received Received - Intake

Authentication Bypass in Blacklist Manager for WooCommerce

Publication date: 2026-09-28

Last updated on: 2026-09-28

Assigner: WPScan

Description
The Blacklist Manager for WooCommerce WordPress plugin from 1.3.0 to 2.3.1 does not enforce its user blocking on every authentication path, allowing the holder of an account the site owner has blocked to keep authenticating with that account's privileges, without the block being enforced or recorded.

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Meta Information

Published
2026-09-28
Last Modified
2026-09-28
Generated
2026-09-28
AI Q&A
2026-09-28
EPSS Evaluated
N/A
NVD
CVE-2026-88828
EUVD
EUVD-2026-88100

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
woocommerce blacklist_manager From 1.3.0 (inc) to 2.3.1 (inc)
woocommerce blacklist_manager 2.3.2

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

The Blacklist Manager for WooCommerce plugin (versions 1.3.0 to 2.3.1) has a flaw where blocked users can bypass restrictions. The plugin fails to enforce user blocking across all authentication methods like XML-RPC and Application Passwords. This allows a blocked user to authenticate and retain their privileges without the block being enforced or recorded.

Detection Guidance

Check if the Blacklist Manager for WooCommerce plugin is installed and verify its version. If it is between 1.3.0 and 2.3.1, the system is vulnerable. Inspect authentication logs for blocked users still accessing the system via XML-RPC or Application Passwords.

Impact Analysis

This vulnerability allows a previously blocked user to regain access to the system despite being blocked. It could lead to unauthorized actions, data breaches, or misuse of privileges. The impact depends on the site's sensitivity and the privileges of the blocked user.

Compliance Impact

This vulnerability could violate compliance requirements that mandate strict access controls and user blocking enforcement, such as GDPR's data protection principles or HIPAA's access control rules. Failure to enforce blocks may result in non-compliance and potential legal consequences.

Mitigation Strategies

Update the Blacklist Manager for WooCommerce plugin to version 2.3.2 or later immediately. Review and block affected user accounts through alternative methods if the plugin cannot be updated right away.

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