External risk intelligence

ARMember Premium Unauthenticated SQL Injection.

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-42417

ARMember is a WordPress membership plugin. Plugins of this type are commonly used to manage user registrations, logins, and member profiles, which are typically exposed as public-facing web endpoints to allow user interaction.

SQL Injection

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in the ARMember Premium plugin, affecting how user data is managed. This issue could potentially be exploited by unauthorized individuals to access sensitive information. The main concern is to confirm if this plugin is in use and assess potential exposure.

Unauthenticated SQL injection flaw found.
Potential for unauthorized data access.
Confirm relevance and assess exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending a specially crafted request to a web application using the affected plugin. Because the vulnerability is unauthenticated and exposed to the network, an attacker does not need any prior access or credentials to trigger it. This could lead to unauthorized access to sensitive data.

No authentication required.
SQL injection via crafted request.
Unauthorized data access.

Live Threat

Current exploitation, exposure, and threat context

This unauthenticated SQL injection vulnerability could allow an attacker to access or modify sensitive data within the ARMember Premium plugin's database when exposed to the network. This could impact user data managed by the membership plugin.

Database records.
Via network requests.
Unauthorized data access.

Operational Fix

Recommended remediation, mitigation, and detection steps

To address this SQL injection vulnerability in ARMember Premium, the initial focus should be on identifying all instances of the affected plugin across your web presence. System owners and platform teams need to confirm reachability and business criticality to prioritize remediation efforts. Once accountable owners are identified, a coordinated plan can be developed based on the assessed risk.

Application owners should own the issue.
Verify plugin presence and exposure first.
Plan remediation by risk and business impact.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is ARMember Premium?

ARMember Premium is a membership management plugin for WordPress sites. It is designed to handle core community features such as user registration, login processes, and member profile management. Because these functions must be accessible to site visitors, the plugin facilitates the interaction between your web application and its users by managing data related to memberships directly within your WordPress environment.

What does SQL injection mean for CVE-2026-42417?

This vulnerability is classified as CWE-89, which occurs when software improperly handles user-supplied data in database queries. In the context of CVE-2026-42417, an attacker can input malicious database commands instead of expected information. If the plugin fails to sanitize this input, the database may execute the attacker's code, potentially exposing sensitive information stored within the membership plugin's tables.

How can an attacker trigger this vulnerability?

An attacker triggers this flaw by sending a specially crafted network request to the web application. Because the vulnerability does not require authentication, the attacker does not need a user account or any prior credentials to initiate the request. The bug is not triggered by standard, legitimate user activity, but specifically through malicious inputs designed to manipulate the underlying database query.

Is my site at risk from this CVE?

Your risk depends on whether your site runs the affected version of ARMember and if it is network-accessible. According to Halo Surface Signal, this plugin is typically used for public-facing web endpoints to allow user interaction, making it frequently exposed to the internet. If your WordPress site exposes these membership features to the public web, the vulnerability is reachable by remote attackers.

What should I do if I use this plugin?

Start by confirming where ARMember Premium is installed across your web infrastructure. Since this is a critical database-related issue, identify the owners for each site to ensure they are aware of the risk. Once you have a clear inventory of all instances, prioritize remediation based on the business importance of the affected sites and coordinate a plan to update or secure the plugin to prevent potential unauthorized access.

References

patchstack.com/database/wordpress/plugin/armember/vulnerability/word…

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.