CVE-2026-88849: MasterStudy LMS WordPress Plugin missing authorization check vulnerability

low 2.7 published 2026-10-22

Affected versions: 3.7.13 up to (not including) 3.7.55
Fixed in: 3.7.55
Latest version: 3.7.58
Severity: Low · CVSS 2.7
Active installs: 10,000+
Type: Missing authorization check

What an attacker needs

Access: An admin-level account (per the CVSS score).

CVSS vector (score by CISA ADP): CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

What to do now

Update MasterStudy LMS WordPress Plugin to 3.7.55 or newer (the latest is 3.7.58): Dashboard → Updates, or Plugins → “update now”.
If you cannot update right away, deactivate it until you can.
Turn on auto-updates for it: Plugins → “Enable auto-updates” on its row.
Not sure which version you run? Check your version against every known MasterStudy LMS WordPress Plugin issue. With WP-CLI: wp plugin get masterstudy-lms-learning-management-system --field=version.
If you ran an affected version and something looks off (new admin users, spam pages, redirects), run the free scan below.

The advisory

The MasterStudy LMS WordPress Plugin 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, enabling impersonation and phishing.

Description from the CVE record, published by WPScan (the CVE Numbering Authority), via the NVD entry for CVE-2026-88849.

References

NVD CVE-2026-88849 nvd.nist.gov
WPScan advisory wpscan.com

Ran an affected version? Check your site for signs of a hack

The free scan reads the public side of your site and looks for spam pages, hidden redirects, injected scripts and blacklist entries. No login, no install, about a minute.

Where this data comes from

CVE record, score and references: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
Versions and install counts: wordpress.org/plugins/masterstudy-lms-learning-management-system (Plugins API), fetched 2026-11-04.
The summary, “what an attacker needs” and “what to do” sections are our plain-English reading of the record and the plugin's release history; the quoted description is the record's own text. Spot an error? Email Daniel.