CVE-2026-81200 MasterStudy CVE debrief

Who should care

Users of MasterStudy LMS WordPress Plugin, especially those with instructor roles, and administrators of WordPress sites using this plugin should be aware of this vulnerability and take necessary steps to restrict access to order information and prevent exploitation. This includes verifying the version of the plugin installed on their WordPress sites and implementing proper validation and sanitization of order IDs.

Technical summary

The MasterStudy LMS WordPress Plugin before 3.7.42 does not correctly restrict access to order information, allowing any user with the instructor role to read other users' order billing details by enumerating order IDs. This vulnerability can be exploited by users with instructor roles to access sensitive information, including name, email address, phone number, and postal address. To mitigate this vulnerability, it is recommended to restrict access to order information based on user roles and implement proper validation and sanitization of order IDs.

Defensive priority

Verify and restrict instructor role access to sensitive order information.

Recommended defensive actions

• Restrict access to order information based on user roles
• Implement proper validation and sanitization of order IDs
• Monitor for suspicious activity related to order information access
• Verify and restrict instructor role access to sensitive order information
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The MasterStudy LMS WordPress Plugin before 3.7.42 does not correctly restrict access to order information. Evidence from WPScan indicates a vulnerability in MasterStudy LMS WordPress Plugin before 3.7.42. WPScan found that any user with the instructor role can read other users' order billing details, including name, email address, phone number, and postal address, by enumerating order IDs. Defenders should verify the version of the plugin installed on their WordPress sites and restrict access to order information based on user roles.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.