CVE-2026-7106: Highland Software Custom Role Manager vulnerability — full analysis & how to protect
Critical security flaw in Highland Software Custom Role Manager on WordPress sites. Severity: High (CVSS 8.8). Published 2026-04-27. Full technical breakdown, who is at risk, and exact mitigation steps.
TL;DR — what you need to know
A high-severity vulnerability has been found in the Highland Software Custom Role Manager plugin for WordPress. This flaw allows any logged-in user, including those with minimal permissions like a Subscriber, to change their own user role to a more powerful one, such as Administrator. This gives an attacker full control over the website, and all sites using version 1.0.0 or older of this plugin are at risk and must take immediate action.
Technical analysis
The vulnerability, identified as CVE-2026-7106 with a CVSS score of 8.8, is a Privilege Escalation flaw within the Highland Software Custom Role Manager plugin for WordPress. The issue originates in the hscrm_save_user_roles() function. This function is designed to handle the logic for saving user role modifications but is insecurely attached to the personal_options_update action hook. This specific hook is triggered whenever any user updates their own profile page (/wp-admin/profile.php), an action accessible to all authenticated users, regardless of their permission level.
The root cause of the vulnerability is a missing authorization check. The hscrm_save_user_roles() function fails to verify if the user initiating the request possesses the necessary capabilities to modify user roles, such as the promote_users capability which is typically reserved for Administrators. Because this critical security check is absent, the function processes any role data submitted through the profile update form. An attacker can exploit this by crafting a POST request to their own profile page that includes the necessary parameters to assign themselves a new, more privileged role.
The exploitation path is straightforward for an authenticated attacker. After logging in with a low-privilege account (e.g., Subscriber), the attacker can navigate to their user profile page and intercept the update request or use developer tools to inject additional form data. By submitting a payload that specifies a target role like 'administrator', the vulnerable function will execute the change without question. This allows the attacker to bypass the WordPress access control model entirely, escalating their privileges from a restricted user to a full administrator, thereby gaining complete control over the website. The specific request parameters required to execute the attack are not specified in the public disclosure.
Who is at risk
Any WordPress website using the Highland Software Custom Role Manager plugin in versions up to and including 1.0.0 is at risk. This type of plugin is often installed on websites that require more granular control over user permissions than what WordPress offers by default. This includes membership sites, e-commerce platforms with different customer tiers, multi-author blogs, and online learning systems where distinct roles for instructors, students, and editors are necessary. The core function of the plugin is to manage and enforce a permission hierarchy, which this vulnerability completely undermines.
The risk is significantly amplified on sites that have open user registration enabled. This configuration provides a trivial entry point for an attacker to create the low-privileged account required to launch the exploit. However, sites with closed registration are not immune; any existing authenticated user, such as a customer, a forum member, or a basic contributor, can leverage this vulnerability to gain administrative access. Given that the exploit is accessible from a standard user profile page, the attack surface is broad, and any site running a vulnerable version should be considered compromised until patched.
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Site owners and administrators must take immediate steps to address this high-severity vulnerability. The following mitigation strategy is recommended:
- Update Immediately: The primary and most effective solution is to update the Highland Software Custom Role Manager plugin to the latest patched version. The vulnerability is fixed in versions greater than 1.0.0. Navigate to your WordPress dashboard, go to the 'Plugins' page, and apply the update as soon as it is available. Do not delay this action.
- Backup Your Site: Before performing any updates or security changes, always create a complete backup of your website's files and database. A reliable backup ensures you can restore your site to a functional state if the update process causes any unexpected issues.
- Interim Containment: If a patched version is not immediately available or you cannot update right away, you should disable and delete the plugin to remove the vulnerable code from your site. If disabling the plugin is not feasible due to operational requirements, a Web Application Firewall (WAF) may offer partial protection. A skilled security professional could write a custom WAF rule to block requests to
profile.phpthat contain parameters related to role changes, but this is a complex and less reliable solution than patching or removal. - Automated Detection and Verification: After applying the patch, verify that the vulnerability is gone. Security scanning tools can help confirm that your site is secure. Services like GuardLabs Web-Audit Guardian, among other reputable WordPress security scanners, can perform checks to detect this and other known vulnerabilities, providing assurance that the mitigation was successful and your site remains protected against ongoing threats.
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View Care plansFrequently asked questions
An attacker with any user account, even a subscriber, could grant themselves Administrator privileges. This gives them complete control to deface the site, steal user data, install malware, or delete the entire website.
No. While open registration makes it easier for an attacker to get an account, any existing authenticated user can exploit this. This includes customers, authors, or any other non-admin role on your site.
You can see the version number for the Highland Software Custom Role Manager plugin on the 'Plugins' page in your WordPress admin dashboard. All versions up to and including 1.0.0 are vulnerable.
No, there is no safe way to fix the code without updating. The only secure alternatives to updating are to disable and delete the plugin or, as a temporary measure, use a professionally configured Web Application Firewall (WAF) to block exploit attempts.
It is a type of security flaw that allows an attacker to gain access to permissions and data that they are not authorized to have. In this case, a low-level user can 'escalate' their role to a high-level one like an administrator.
Disclosure timeline
- 2026-04-27Published in NVD
- 2026-05-03GuardLabs analysis