CVE-2021-36403

mediumpriority · track · 21EPSS 0.005 · 44 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.53% (44th) EPSS

CVSS 5.3 · medium

Is it mine?

12 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

In Moodle, in some circumstances, email notifications of messages could have the link back to the original message hidden by HTML, which may pose a phishing risk.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.1–5.3

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.13.1lowAV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondaryexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · OSV

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USCWE-912USCWE-912US

affected products (12)

Products and version ranges known to be affected.

n/a Moodle≤ 3.11, 3.10 to 3.10.4, 3.9 to 3.9.7 and earlier unsupported versionsenisa_euvdEU
Мартин Догиамас Moodle3.9.0 → 3.11.0fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.2 Муромfstec_bduRU
moodle moodle< 3.9.8nvdUScpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
moodle moodle3.10.0 → 3.10.5nvdUScpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
moodle moodle3.11.0 → 3.11.1nvdUScpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
Bitnami moodle< 3.9.8osvUSpkg:bitnami/moodle
Bitnami moodle3.10.0 → 3.10.5osvUSpkg:bitnami/moodle
Bitnami moodle3.11.0 → 3.11.1osvUSpkg:bitnami/moodle
Packagist moodle/moodle< 3.9.8osvUSpkg:composer/moodle/moodle
Packagist moodle/moodle3.10.0-beta → 3.10.5osvUSpkg:composer/moodle/moodle
Packagist moodle/moodle3.11.0-beta → 3.11.1osvUSpkg:composer/moodle/moodle

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-0579Moodle: Mehrere SchwachstellenDeutsch2023-03-06csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Moodle ausnutzen, um beliebigen Programmcode auszuführen, Informationen offenzulegen, Dateien zu manipulieren, Sicherheitsvorkehrungen zu umgehen oder einen Cross-Site-Scripting-Angriff durchzuführen.
GHSA-j9cw-5cpj-9qj5Moodle has a Hidden Functionality vulnerability2023-03-07ghsa · osvUS
In Moodle, in some circumstances, email notifications of messages could have the link back to the original message hidden by HTML, which may pose a phishing risk.
BIT-moodle-2021-364032024-03-06vendor · osvUS
In Moodle, in some circumstances, email notifications of messages could have the link back to the original message hidden by HTML, which may pose a phishing risk.

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv nvd cert_bund NVD CVE.org MITRE

published 2023-03-06modified 2026-06-17

references (7)

External citations — patches, advisories, analysis.

scry

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