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Masteriyo LMS CVE-2024-24882

CRITICAL
Incorrect Privilege Assignment (CWE-266)
2024-05-17 audit@patchstack.com
9.8
CVSS 3.1 · NVD
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Scan WordPress sites for Masteriyo plugin
  2. Delivery
    Identify version <= 1.7.2
  3. Exploit
    Send crafted request to vulnerable endpoint
  4. Execution
    Obtain elevated privileges via incorrect role assignment
  5. Persist
    Access course data and admin functions
  6. Impact
    Exfiltrate data or backdoor site

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V8 - Authorization Privilege assignment review
Exploitation Conditions

Exploitation requires that the target WordPress site has the Masteriyo - LMS plugin installed and activated at version 1.7.2 or earlier, and that the vulnerable plugin endpoints are reachable over the network (the default for any publicly accessible WordPress site running the plugin). Per the CVSS vector AV:N/AC:L/PR:N/UI:N, no authentication, no user interaction, and no special configuration beyond the plugin being active is needed. The principal limiting factor is plugin presence and version: sites that do not run Masteriyo, or that run a version above 1.7.2, are not affected; sites that have firewalled the WordPress REST API or plugin endpoints from the public internet also limit exposure.

Impact

The CVSS:3.1 vector AV:N/AC:L/PR:N/UI:N indicates network-reachable, low-complexity exploitation with no authentication and no user interaction, and C:H/I:H/A:H reflects full impact across confidentiality, integrity, and availability - consistent with a critical 9.8 rating. EPSS at 31.54% (97th percentile) is unusually high and signals elevated likelihood of exploitation attempts relative to the broader CVE population, even though the issue is not currently in CISA KEV and no public exploit code is identified at time of analysis. The Patchstack tag of 'Information Disclosure' is narrower than the CVSS impact, which is a mild conflict - CVSS suggests full compromise via privilege escalation while the tag emphasizes data exposure; defenders should treat the CVSS picture as the worst-case envelope. Overall this is a real priority for any WordPress site running Masteriyo <= 1.7.2, particularly because plugin-targeting bots routinely sweep the public internet for known LMS flaws.

Exploit ScenarioDerived

An unauthenticated attacker scans the public web for WordPress sites running Masteriyo LMS <= 1.7.2, then sends a crafted HTTP request to a vulnerable plugin endpoint that mis-assigns privileges, granting the attacker an elevated role on the site. With elevated privileges the attacker can read or modify course content, exfiltrate enrolled-student PII, plant malicious JavaScript in lessons, or pivot to broader administrative control of the WordPress instance. No public exploit is identified at time of analysis, but the high EPSS percentile suggests automated scanning and exploitation attempts are plausible.

Emergency Immediate action required. Why: CRITICAL + EPSS > 30%, no patch available.
No patch listed yet 31.5% exploitation probability (EPSS)

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AnalysisAI

Privilege escalation in the Masteriyo LMS WordPress plugin (versions up to and including 1.7.2) allows remote unauthenticated attackers to assign themselves elevated privileges due to incorrect privilege assignment logic. With a CVSS score of 9.8 and an EPSS score of 31.54% (97th percentile), this flaw poses significant real-world risk, though no public exploit is identified at time of analysis and it is not listed in CISA KEV.

RemediationAI

Upgrade the Masteriyo - LMS plugin to a version newer than 1.7.2 as published by the vendor on the WordPress plugin repository; the exact fixed version is not specified in the available input data, so administrators should consult the Patchstack advisory and the plugin changelog to identify the first patched release. If immediate patching is not possible, restrict access to the WordPress site's REST API and plugin endpoints (e.g., /wp-json/masteriyo/*) via a Web Application Firewall or .htaccess rules, deactivate the Masteriyo plugin until it can be updated (side effect: course pages and student access will be unavailable), and audit existing user accounts and roles for unauthorized privilege grants. Consider deploying Patchstack or a comparable virtual patching service that may already mitigate this CVE at the WAF layer.

Affects your stack

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Technical ContextAI · show details

Masteriyo is a WordPress-based Learning Management System (LMS) plugin developed by ThemeGrill (CPE: cpe:2.3:a:themegrill:masteriyo), used to deliver online courses on WordPress sites. The root cause is CWE-266 (Incorrect Privilege Assignment), meaning the plugin assigns privileges to users or roles in a way that does not match the intended access control model - typically allowing low-privilege or unauthenticated actors to obtain higher-privileged capabilities (such as instructor or administrator-equivalent rights) on the WordPress site. Because WordPress plugins execute in the same context as core and share the database, a privilege flaw here can translate into broad control over course content, student PII, and potentially the wider site.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

Incorrect Privilege Assignment vulnerability in masteriyo Masteriyo - LMS learning-management-system.This issue affects Masteriyo - LMS: from n/a through <= 1.7.2.

Executive ViewAI

Why It Matters

The Masteriyo LMS WordPress plugin (versions ≤1.7.2) contains a critical privilege escalation flaw (CVSS 9.8) allowing remote unauthenticated attackers to grant themselves administrative access. Any organization deploying this plugin faces immediate risk of complete system compromise with no vendor patch available; the 97th percentile exploitation likelihood (EPSS 31.54%) indicates realistic attack urgency.

Business Impact: Severe
Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations: (1) disable and deactivate the plugin on all WordPress instances until patched; (2) restrict direct access to WordPress admin panels via network controls or WAF; (3) implement role-based access controls and audit administrative user assignments for unauthorized privilege escalations; (4) monitor authentication logs and privilege changes for suspicious activity; (5) consider temporary alternative LMS solutions during remediation period.

Threat Intelligence Overview

Threat Score
4.4/10
Composite threat intelligence
EPSS Score
31.5%
Top 3% exploitable
Exploit
POC
Public exploit code exists
Data Quality
4 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC Yes
EPSS 31.5%
Patch available No
Active threat Yes
Deciding rule
CRITICAL + EPSS > 30%, no patch available
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Out-of-Cycle
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
Very High

Priority Score

101
Low Medium High Critical
KEV: 0
EPSS: +32
CVSS: +49
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:a:themegrill:masteriyo:*:*:*:*:free:wordpress:*:*
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