Search for vulnerabilities
Vulnerability details: VCID-jynd-tu1w-qfbf
Vulnerability ID VCID-jynd-tu1w-qfbf
Aliases CVE-2021-36401
GHSA-g6h6-4fp6-w33w
Summary Moodle vulnerable to Stored Cross-site Scripting In Moodle, ID numbers exported in HTML data formats required additional sanitizing to prevent a local 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 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2021-36401
epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2021-36401
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-g6h6-4fp6-w33w
cvssv3.1 4.8 https://github.com/moodle/moodle
generic_textual MODERATE https://github.com/moodle/moodle
cvssv3.1 4.8 https://moodle.org/mod/forum/discuss.php?d=424807
generic_textual MODERATE https://moodle.org/mod/forum/discuss.php?d=424807
ssvc Track https://moodle.org/mod/forum/discuss.php?d=424807
cvssv3.1 4.8 https://nvd.nist.gov/vuln/detail/CVE-2021-36401
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-36401
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-36401
https://github.com/moodle/moodle
https://moodle.org/mod/forum/discuss.php?d=424807
https://nvd.nist.gov/vuln/detail/CVE-2021-36401
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-g6h6-4fp6-w33w https://github.com/advisories/GHSA-g6h6-4fp6-w33w
No exploits are available.
Vector: CVSS:3.1/AV:A/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:A/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://moodle.org/mod/forum/discuss.php?d=424807
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/2025-03-07T18:02:05Z/ Found at https://moodle.org/mod/forum/discuss.php?d=424807
Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-36401
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 0.33452
EPSS Score 0.0013
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:15:18.364695+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-g6h6-4fp6-w33w/GHSA-g6h6-4fp6-w33w.json 36.1.3