CVE-2026-88849 MasterStudy CVE debrief

Who should care

Defenders of WordPress sites using MasterStudy LMS 3.7.13 - 3.7.54 should assess exposure and verify version to prevent potential security breaches. This includes administrators, security teams, and operators who manage WordPress sites with the MasterStudy LMS plugin installed. They should be aware of the potential for impersonation and phishing attacks and take necessary precautions to mitigate the vulnerability.

Why it matters

CVE-2026-88849 allows Instructor+ users to update display names of any user, enabling impersonation and phishing. Defenders of WordPress sites using MasterStudy LMS 3.7.13 - 3.7.54 should assess exposure and verify version.

• Instructor+ users can update display names of any registered user
• Impersonation and phishing possible via display name changes

Technical summary

The MasterStudy LMS WordPress Plugin before 3.7.55 does not verify that a user targeted through its student-enrolment feature has any relationship to the requesting instructor, allowing users with the Instructor role to overwrite the first name, last name and public display name of any registered user on the site, including administrators. This vulnerability can be exploited by Instructor+ users to update display names of any registered user, enabling impersonation and phishing attacks. The vulnerability has a significant impact on the security of WordPress sites using MasterStudy LMS 3.7.13 - 3.7.54.

Defensive priority

Assess exposure of Instructor+ role users, verify version and update to 3.7.55 if possible, monitor for suspicious user display name changes

Recommended defensive actions

• Assess exposure of Instructor+ role users
• Verify version and update to 3.7.55 if possible
• Monitor for suspicious user display name changes
• 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
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

Official CVE Program record and NIST NVD detail page provide information on the vulnerability. WPScan also provides a technical description of the vulnerability. The CVE record was published on 2026-10-22T06:00:18.654Z and has not been modified since then. The vulnerability has a high impact on the security of WordPress sites using MasterStudy LMS 3.7.13 - 3.7.54. The lack of verification for user relationships through the student-enrolment feature allows for arbitrary display name updates.

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.