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MasterStudy LMS WordPress Plugin – for Online Courses and Education <= 3.7.55 — Authenticated (Subscriber+) PHP Object Injection

CVE-2026-118090Published · Updated

Action summary

Affected: ≤3.7.55Update to 3.7.56 or newer

All remediation steps
Watch plugin
Severity
High7.5
CVSS
7.5
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:H Attack complexity
High
PR:L Privileges required
Low
UI:N User interaction
None
S:U Scope
Unchanged
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-502 PHP Object Injection
Required access
Unknown
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

MasterStudy LMS WordPress Plugin – for Online Courses and Education masterstudy-lms-learning-management-system

  1. Affected≤ 3.7.55
  2. Patched in3.7.56

Update to 3.7.56 or newer.

You are affected if you run ≤ 3.7.55. Version 3.7.56 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under MasterStudy LMS WordPress Plugin – for Online Courses and Education.
  • No admin access? Run a passive check of your site. It reads public files only.

What to do

  1. Update to version 3.7.56, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch MasterStudy LMS WordPress Plugin – for Online Courses and Education to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Siyang Wu.

The MasterStudy LMS WordPress Plugin – for Online Courses and Education plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.7.55. This is due to deserialization of untrusted input. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in MasterStudy LMS WordPress Plugin – for Online Courses and Education

All 60
More vulnerabilities in MasterStudy LMS WordPress Plugin – for Online Courses and Education
SeverityVulnerabilityCVEPublished
Medium5.4Authenticated (Subscriber+) Arbitrary Shortcode Exeuction
≤3.7.56Update to 3.7.57
CVE-2026-119478
Medium4.3Missing Authorization
≤3.7.55Update to 3.7.56
CVE-2026-118092
Medium4.3Missing Authorization
≤3.7.49Update to 3.7.50
CVE-2026-80069
Medium4.3Authenticated (Custom+) Path Traversal
≤3.7.49Update to 3.7.50
CVE-2026-80067
Medium4.33.7.54 - Missing Authorization
3.7.13 – 3.7.54Update to 3.7.55
CVE-2026-88849

Same weakness (PHP Object Injection)

All PHP Object Injection
Other PHP Object Injection vulnerabilities
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup≤5.25.25Update to 5.26.45
CVE-2026-120688
Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder≤1.0.2Update to 1.1
CVE-2026-125055
Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System≤3.3.9Update to 3.4.0
CVE-2026-119077
Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce≤5.127.0Update to 5.128.0
CVE-2026-121518

Timeline

  1. CVE published

    Severity high, CVSS 7.5

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
CVE® identifiers
[object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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