CVE-2026-42743
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedUnauthenticated Broken Authentication in Masteriyo - LMS <= 2.1.8 versions.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThis is an unauthenticated broken authentication vulnerability in the Masteriyo WordPress LMS plugin affecting versions 2.1.8 and below. The flaw allows attackers to bypass authentication mechanisms and potentially gain unauthorized access to the learning management system without valid credentials.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Verify Masteriyo LMS plugin is installedCheck for the Masteriyo plugin directory at wp-content/plugins/masteriyo-lms or look for 'Masteriyo' in the WordPress admin under Plugins > Installed PluginsAffected if the plugin is not found in the WordPress installation at all, then the vulnerability does not apply
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Check installed Masteriyo LMS versionLocate the main plugin file (usually masteriyo.php) and read the 'Version' header, or view the version in WordPress admin under Plugins > Installed Plugins > MasteriyoAffected if the reported version number is 2.1.8 or lower (for example, 2.1.8, 2.1.7, 2.1.6, 2.0.0, etc.)
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Confirm plugin is activeIn WordPress admin, verify the Masteriyo plugin status shows as 'Active' under Plugins > Installed PluginsAffected if the plugin is active; an installed but deactivated plugin would not expose the vulnerable authentication code to requests
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Identify authentication-related endpointsReview the site for Masteriyo REST API endpoints under /wp-json/masteriyo/ (such as /wp-json/masteriyo/v1/auth/ endpoints) that handle login or authentication without requiring WordPress session credentialsAffected if unauthenticated endpoints exist that process authentication requests without validating user credentials properly
You are affected if Masteriyo LMS plugin is installed, active, and running at version 2.1.8 or below, with unauthenticated authentication endpoints exposed.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpdate Masteriyo - LMS to the latest version beyond 2.1.8 which contains the security patch. If immediate update is not possible, consider disabling the plugin or implementing additional access controls at the web application firewall level.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,696.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-42743 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-42743 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data