CVE-2026-66594
Deferred Deferred - Pending Action

Subscriber SQL Injection in WordPress Persistent Login

Publication date: 2026-08-20

Last updated on: 2026-08-20

Assigner: Patchstack

Description
Subscriber SQL Injection in WordPress Persistent Login <= 3.1.0 versions.

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Meta Information

Published
2026-08-20
Last Modified
2026-08-20
Generated
2026-08-20
AI Q&A
2026-08-20
EPSS Evaluated
N/A
NVD
CVE-2026-66594
EUVD
EUVD-2026-63337

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
patchstack persistent_login to 3.1.0 (inc)
patchstack persistent_login 3.1.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-89 The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.

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Executive Summary

This is a SQL Injection vulnerability in the WordPress Persistent Login plugin versions 3.1.0 and below. It allows attackers to inject malicious SQL queries into the website's database through the plugin's subscriber functionality. The flaw enables direct interaction with the database, potentially leading to unauthorized data access or manipulation.

Detection Guidance

To detect this SQL injection vulnerability in WordPress Persistent Login <= 3.1.0, check the plugin version installed on your WordPress site. Use the WordPress admin dashboard under Plugins to verify the version. Alternatively, use WP-CLI with the command: wp plugin list | grep persistent_login. If the version is 3.1.0 or below, the site is vulnerable.

Impact Analysis

Attackers could exploit this to steal sensitive information from your website's database, such as user credentials, personal data, or other confidential details. It may also allow unauthorized modifications to the database, leading to website defacement or disruption of services.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR and HIPAA requirements for protecting personal and health information. Non-compliance may result in legal penalties, fines, and reputational damage due to unauthorized data exposure.

Mitigation Strategies

Immediately update the WordPress Persistent Login plugin to version 3.1.1 or later. If immediate updating is not possible, apply the Patchstack mitigation rule provided by Patchstack to block attacks until the update is applied. Remove or disable the plugin if not essential.

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