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Fencer Vulns
high 7.5

CVE-2023-4278 json

MasterStudy LMS < 3.0.18 - Unauthenticated Instructor Account Creation

published 2023-09-11 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-54149

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
6.2%
EPSS 6.2% chance of exploitation in 30 days, percentile 93%
public exploits
1
Exploit-DB

Summary

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.0.18 does not have proper checks in place during registration allowing anyone to register on the site as an instructor. They can then add courses and/or posts.

Patch / fix

  • Unknown MasterStudy LMS WordPress Plugin 3.0.18

Timeline

  1. Published
  2. First public exploit (EDB-51735)

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

6.24% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-51735 Wordpress Plugin Masterstudy LMS - 3.0.17 - Unauthenticated Instructor Account Creation webapps, 2023-10-09
  • wpscan.com https://wpscan.com/vulnerability/cb3173ec-9891-4bd8-9d05-24fe805b5235 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

  • Unknown MasterStudy LMS WordPress Plugin

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.