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Vulnerability details: VCID-71up-8wxe-xqd4
Vulnerability ID VCID-71up-8wxe-xqd4
Aliases CVE-2021-36399
GHSA-79jp-m64f-pgrc
Summary Moodle Cross-site Scripting vulnerability In Moodle, ID numbers displayed in the quiz override screens required additional sanitizing to prevent a stored XSS risk.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00677 https://api.first.org/data/v1/epss?cve=CVE-2021-36399
epss 0.00677 https://api.first.org/data/v1/epss?cve=CVE-2021-36399
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-79jp-m64f-pgrc
cvssv3.1 5.4 https://github.com/moodle/moodle
generic_textual MODERATE https://github.com/moodle/moodle
cvssv3.1 5.4 https://moodle.org/mod/forum/discuss.php?d=424805
generic_textual MODERATE https://moodle.org/mod/forum/discuss.php?d=424805
ssvc Track https://moodle.org/mod/forum/discuss.php?d=424805
cvssv3.1 5.4 https://nvd.nist.gov/vuln/detail/CVE-2021-36399
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-36399
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-36399
https://github.com/moodle/moodle
https://moodle.org/mod/forum/discuss.php?d=424805
https://nvd.nist.gov/vuln/detail/CVE-2021-36399
cpe:2.3:a:moodle:moodle:3.11.0:-:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:moodle:moodle:3.11.0:-:*:*:*:*:*:*
GHSA-79jp-m64f-pgrc https://github.com/advisories/GHSA-79jp-m64f-pgrc
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/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:L/UI:R/S:C/C:L/I:L/A:N Found at https://moodle.org/mod/forum/discuss.php?d=424805
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:N/T:P/P:M/B:A/M:M/D:T/2025-03-07T18:13:24Z/ Found at https://moodle.org/mod/forum/discuss.php?d=424805
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-36399
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 0.70516
EPSS Score 0.00677
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:15:20.904127+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-79jp-m64f-pgrc/GHSA-79jp-m64f-pgrc.json 36.1.3