Tiare Membership <= 1.2 - प्रमाणीकृत विशेषाधिकार वृद्धि (Unauthenticated Privilege Escalation)

The impact of this vulnerability is severe. An attacker exploiting CVE-2025-13540 can gain complete control over the affected WordPress site. This includes the ability to modify content, install malicious plugins, steal sensitive data (user credentials, customer information, financial details), and potentially pivot to other systems on the network. The lack of authentication required for privilege escalation significantly broadens the attack surface, making this a high-priority concern. Successful exploitation could lead to data breaches, website defacement, and significant reputational damage. This vulnerability shares similarities with other WordPress privilege escalation flaws where improper role assignment during user registration is exploited.

WordPress websites utilizing the Tiare Membership plugin, particularly those with limited security hardening or those running older, unpatched versions of the plugin, are at significant risk. Shared hosting environments where multiple websites share the same server resources are also at increased risk, as a compromise of one site could potentially lead to the compromise of others.

• wordpress / plugin: Use wp-cli to check the plugin version:

wp plugin list | grep tiare-membership

• wordpress / plugin: Search plugin files for the vulnerable function tiaremembershipinitrestapi_register using grep:

grep -r 'tiare_membership_init_rest_api_register' /path/to/wp-content/plugins/tiare-membership/

• wordpress / logs: Monitor WordPress access logs for POST requests to /wp-json/tiare-membership/v1/register with suspicious parameters, particularly those attempting to set the role to 'administrator'. • generic web: Check for unusual user registration patterns via curl:

curl -X POST -d 'username=test&[email protected]&role=administrator' http://your-wordpress-site.com/wp-json/tiare-membership/v1/register

1. 2025-11-27Disclosure

   disclosure

2. 2025-11-27Patch

   patch

1. आरक्षित2025-11-22
2. प्रकाशित2025-11-27
3. संशोधित2026-04-08
4. EPSS अद्यतन2026-03-23

The primary mitigation for CVE-2025-13540 is to immediately upgrade the Tiare Membership plugin to version 1.3 or later. If upgrading is not immediately feasible due to compatibility issues or breaking changes, consider temporarily restricting user registration to trusted administrators only. While not a complete solution, this can limit the immediate risk. Review WordPress user roles and permissions to ensure they are appropriately configured. Implement a Web Application Firewall (WAF) with rules to block suspicious registration attempts, particularly those attempting to assign the 'administrator' role. Monitor WordPress access logs for unusual activity, specifically failed registration attempts and changes to user roles.