CVE-2021-32473Network attack vector

Unreleased quiz-grade disclosure via unchecked review settings

Published Mar 11, 2022 · Updated Aug 3, 2024

Information disclosure in affected Moodle LMS releases allows remote authenticated users to read unreleased quiz grades via a web service. The get_user_best_grade function returned quiz_get_best_grade directly without checking whether combined quiz review options permitted marks to be shown. A student account with a web-service token and a finished attempt is sufficient; affected branches are 3.10 through 3.10.3, 3.9 through 3.9.6, 3.8 through 3.8.8, and 3.5 through 3.5.17.

CVSS severity5.3
Medium
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in affected Moodle LMS releases allows remote authenticated users to read unreleased quiz grades via a web service. The get_user_best_grade function returned quiz_get_best_grade directly without checking whether combined quiz review options permitted marks to be shown. A student account with a web-service token and a finished attempt is sufficient; affected branches are 3.10 through 3.10.3, 3.9 through 3.9.6, 3.8 through 3.8.8, and 3.5 through 3.5.17.

The record

CVE
CVE-2021-32473
Published
Mar 11, 2022
Updated
Aug 3, 2024
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-200, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 11, 2022CVE 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=3.10 to 3.10.3, 3.9 to 3.9.6, 3.8 to 3.8.8, 3.5 to 3.5.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Moodle · Moodle LMSversion=3.10 to 3.10.3, 3.9 to 3.9.6, 3.8 to 3.8.8, 3.5 to 3.5.17

Published CVSS scores

5.3GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

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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