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MasterStudy LMS CVE-2026-81342

| EUVDEUVD-2026-68064 MEDIUM
URL Redirection to Untrusted Site (Open Redirect) (CWE-601)
2026-08-29 WPScan GHSA-368m-gh85-cq79
4.7
CVSS 3.1 · Vendor: WPScan
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Severity by source

Vendor (WPScan) PRIMARY
4.7 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
vuln.today AI
4.7 MEDIUM

Network-reachable with no auth needed, but user must follow crafted link; scope changes to external site; only confidentiality impact via phishing, no integrity or availability effect.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (WPScan).

CVSS VectorVendor: WPScan

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

Lifecycle Timeline

5
CVE Published
Aug 31, 2026 - 10:50 cve.org
MEDIUM 4.7
Analysis Generated
Aug 30, 2026 - 01:32 vuln.today
CVSS changed
Aug 30, 2026 - 01:22 NVD
4.7 (MEDIUM)
Patch available
Aug 29, 2026 - 08:16 EUVD
CVE Published
Aug 29, 2026 - 06:00 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.43 does not validate a redirect parameter supplied during user registration before using it, allowing unauthenticated attackers to redirect users to arbitrary external URLs.

AnalysisAI

Open redirect in MasterStudy LMS WordPress Plugin before version 3.7.43 enables unauthenticated attackers to supply an unvalidated redirect parameter during user registration, silently forwarding newly registered users to arbitrary external URLs. This creates a reliable phishing vector: an attacker crafts a registration link pointing to a spoofed login page, and the plugin delivers the victim there immediately post-registration without warning. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target WordPress site has open user self-registration enabled (the default WordPress setting 'Anyone can register' must be active, or MasterStudy's own registration must be accessible). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score of 4.7 with vector AV:N/AC:L/PR:N/UI:R/S:C/C:L reflects an accurate characterization: network-reachable, trivially exploitable, requiring no authentication, but dependent on a real user completing registration via a crafted URL (UI:R). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade MasterStudy LMS WordPress Plugin to version 3.7.43 or later, which is confirmed as the vendor-patched release per EUVD-2026-68064 and the WPScan advisory (https://wpscan.com/vulnerability/f6f89b50-3087-4fb6-ba12-93fdc1bcc9ed/). … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-81342 vulnerability details – vuln.today

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