Masteriyo LMS <= 3.4.0 — Authenticated (Subscriber+) PHP Object Injection
CVE-2026-82845Published · Updated Action summary
Affected: ≤3.4.0Update to 3.4.1 or newer
All remediation steps- Severity
- High7.5
- CVSS
- 7.5CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:HAttack complexity- High
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:HIntegrity- High
A:HAvailability- High
- Weakness
- CWE-502 PHP Object Injection
- Required access
- Unknown
- Exploit prediction (EPSS)
- 0.6% chance in 30 days51th percentile
- CISA KEV
- Not listed
On this page8
Am I affected?
Masteriyo LMS – LMS Course Builder, Quizzes & Certificates learning-management-system
- Affected≤ 3.4.0
- Patched in3.4.1
Update to 3.4.1 or newer.
You are affected if you run ≤ 3.4.0. Version 3.4.1 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Masteriyo LMS – LMS Course Builder, Quizzes & Certificates.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 3.4.1, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Masteriyo LMS – LMS Course Builder, Quizzes & Certificates to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Karthik Ramakrishnan.
The Masteriyo LMS plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.4.0. 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
- Advisorywordfence.com
Related CVEs
More in Masteriyo LMS – LMS Course Builder, Quizzes & Certificates
All 33| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | Unauthenticated Arbitrary Content Deletion ≤3.4.3Update to 3.5.0 | CVE-2026-116410 | |
| Medium4.3 | Authenticated (Subscriber+) Information Exposure ≤3.4.1Update to 3.4.2 | CVE-2026-82850 | |
| Medium4.3 | Authenticated (Subscriber+) Insecure Direct Object Reference ≤3.4.1Update to 3.4.2 | CVE-2026-82849 | |
| Medium4.3 | 3.4.0 - Authenticated (Custom Role+) Insecure Direct Object Reference 1.14.0 – 3.4.0Update to 3.4.1 | CVE-2026-82851 | |
| Medium6.4 | Authenticated (Custom Role+) Stored Cross-Site Scripting <3.4.1Update to 3.4.1 | CVE-2026-82847 |
- Medium5.3Unauthenticated Arbitrary Content Deletion
≤3.4.3Update to 3.5.0
- Medium4.3Authenticated (Subscriber+) Information Exposure
≤3.4.1Update to 3.4.2
- Medium4.3Authenticated (Subscriber+) Insecure Direct Object Reference
≤3.4.1Update to 3.4.2
- Medium4.33.4.0 - Authenticated (Custom Role+) Insecure Direct Object Reference
1.14.0 – 3.4.0Update to 3.4.1
- Medium6.4Authenticated (Custom Role+) Stored Cross-Site Scripting
<3.4.1Update to 3.4.1
Same weakness (PHP Object Injection)
All PHP Object Injection| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- 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
- 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
- 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
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity high, CVSS 7.5
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. 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.
- EPSS
- Exploit Prediction Scoring System by FIRST.org.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.