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Vulnerability details: VCID-z8jg-d55k-yqfw
Vulnerability ID VCID-z8jg-d55k-yqfw
Aliases CVE-2021-36403
GHSA-j9cw-5cpj-9qj5
Summary Moodle has a Hidden Functionality vulnerability 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.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-912 Hidden Functionality
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00207 https://api.first.org/data/v1/epss?cve=CVE-2021-36403
epss 0.00207 https://api.first.org/data/v1/epss?cve=CVE-2021-36403
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-j9cw-5cpj-9qj5
cvssv3.1 5.3 https://github.com/moodle/moodle
generic_textual MODERATE https://github.com/moodle/moodle
cvssv3.1 5.3 https://moodle.org/mod/forum/discuss.php?d=424809
generic_textual MODERATE https://moodle.org/mod/forum/discuss.php?d=424809
ssvc Track https://moodle.org/mod/forum/discuss.php?d=424809
cvssv3.1 5.3 https://nvd.nist.gov/vuln/detail/CVE-2021-36403
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-36403
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-36403
https://github.com/moodle/moodle
https://moodle.org/mod/forum/discuss.php?d=424809
https://nvd.nist.gov/vuln/detail/CVE-2021-36403
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
GHSA-j9cw-5cpj-9qj5 https://github.com/advisories/GHSA-j9cw-5cpj-9qj5
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://github.com/moodle/moodle
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://moodle.org/mod/forum/discuss.php?d=424809
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-03-07T17:58:43Z/ Found at https://moodle.org/mod/forum/discuss.php?d=424809
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-36403
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.43291
EPSS Score 0.00207
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:15:08.761791+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-j9cw-5cpj-9qj5/GHSA-j9cw-5cpj-9qj5.json 36.1.3