NVD / CVE Program· CNA WPScan

CVE-2026-81196: MasterStudy LMS < 3.7.46 - Instructor+ Quiz Answer Disclosure via IDOR

Noroxi assessment

Priority: Monitor (action score 10/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.29% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Unknown MasterStudy LMS WordPress Plugin 3.7.46.

Low priority for now. Upgrade to Unknown MasterStudy LMS WordPress Plugin 3.7.46 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.46 does not properly verify ownership of quiz question identifiers, allowing users with instructor access to read other instructors' quiz questions, including the correct answers and explanations.

LowCVSS 2.7 · v3.1—No exploit Fix available

Broken access control (IDOR)

EUVD-2026-69849

Published: Sep 2, 2026
Updated: Sep 3, 2026
EPSS: 0.2% · 22th percentile
CWE: CWE-639

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 10 / 40 · 2.7 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

Is MasterStudy LMS WordPress Plugin – for Online Courses and Education on your site?

WP Lens reads your site's plugin, theme and WordPress versions from the outside and matches them to known vulnerabilities. Works without an account.

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

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Versions reported by the vendor

Affected version ranges reported by the assigning authority (WPScan). Independent of NVD's CPE analysis and usually ahead of it.

Unknown MasterStudy LMS WordPress Plugin
- before 3.7.46affected · semver

Same product

unknown: all records

Other highest-scoring records for the same primary product.

CVE-2026-88843MasterStudy LMS 3.5.29 - < 3.7.50 - Contributor+ LFI via Elementor Courses Categories Widget
28Monitor
CVE-2026-88846MasterStudy LMS 2.3.0 - < 3.7.50 - Unauthenticated Account Creation with Registration Disabled
21Monitor
CVE-2026-81199MasterStudy LMS < 3.7.46 - Unauthenticated Student Statistics Disclosure via student/stats REST Route
21Monitor

Published before and after this one in the same product

← EarlierCVE-2026-81194Sep 2, 2026 · MasterStudy LMS < 3.7.46 - Subscriber+ Cross-Instructor Order Data Disclosure via author_id Parameter
17Monitor
← EarlierCVE-2026-81195Sep 2, 2026 · MasterStudy LMS < 3.7.46 - Unauthenticated Student Enrollment Disclosure via student-courses REST Route
21Monitor
Later →CVE-2026-81197Sep 2, 2026 · MasterStudy LMS < 3.7.46 - Unauthenticated Unpublished Course Title Disclosure via course-list REST Route
21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Unknown MasterStudy LMS WordPress Plugin	3.7.46	Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Revanth Hari Narayana Mattefinder
WPScancoordinator

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-811940 days apartMasterStudy LMS < 3.7.46 - Subscriber+ Cross-Instructor Order Data Disclosure via author_id Parameter
17Monitor
CVE-2026-8133921 days apartMasterStudy LMS < 3.7.50 - Subscriber+ Quiz Attempt Grade Disclosure via IDOR
17Monitor
CVE-2026-811980 days apartMasterStudy LMS < 3.7.46 - Instructor+ Cross-Course Curriculum Deletion and Tampering via IDOR
15Monitor
CVE-2026-8134016 days apartMasterStudy LMS < 3.7.50 - Instructor+ Order Status Manipulation via IDOR
15Monitor
CVE-2026-812004 days apartMasterStudy LMS < 3.7.42 - Instructor+ Cross-Tenant Order Billing PII Disclosure via IDOR
10Monitor
CVE-2026-8884416 days apartMasterStudy LMS 3.6.2 - < 3.7.50 - Instructor+ Student PII Disclosure via IDOR
10Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
Administrator privileges are required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: low · data can be read
Integrity: none
Availability: none

Attack vector: Network
Attack complexity: Low
Privileges required: High
User interaction: None
Scope: Unchanged
Confidentiality impact: Low
Integrity impact: None
Availability impact: None

Weakness class (CWE)

CWE-639 · Authorization Bypass Through User-Controlled Key

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

nvd-secondary

Root cause

The endpoint fetches the record by the ID sent in the request, but never checks whether the record belongs to the requesting user.

The bug in code

The whole CWE-639 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const invoice = await Invoice.findById(req.params.id);
2res.json(invoice);

Fixed

1const invoice = await Invoice.findOne({
2  id: req.params.id,
3  ownerId: req.user.id,
4});
5if (!invoice) return res.sendStatus(404);
6res.json(invoice);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

For records you follow, these changes also arrive as notifications. →

References

wpscan.com/vulnerability/d11acb84-6dd0-4229-ac30-dba3ad6b9614/

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records