CVE-2021-24183Public exploitNetwork attack vector

Database disclosure via unprepared question lookup

Published Apr 5, 2021 · Updated Aug 3, 2024

UNION-based SQL injection in Themeum Tutor LMS before 1.8.3 allows remote authenticated users to read database data via an AJAX request. The tutor_quiz_builder_get_question_form handler interpolates the untrusted question_id value into a get_row() SELECT without a prepared statement. Student access is sufficient because the AJAX action lacks nonce and capability checks, and query results are returned in the response.

CVSS severity6.5
Medium
EPSS probability1.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

UNION-based SQL injection in Themeum Tutor LMS before 1.8.3 allows remote authenticated users to read database data via an AJAX request. The tutor_quiz_builder_get_question_form handler interpolates the untrusted question_id value into a get_row() SELECT without a prepared statement. Student access is sufficient because the AJAX action lacks nonce and capability checks, and query results are returned in the response.

The record

CVE
CVE-2021-24183
Published
Apr 5, 2021
Updated
Aug 3, 2024
Vendor
Themeum
Product
Tutor LMS
Classifications
CWE-89, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.8.3 <1.8.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Themeum · Tutor LMSversion=1.8.3 <1.8.3

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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