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Vulnerability details: VCID-ndde-vs8m-fkbz
Vulnerability ID VCID-ndde-vs8m-fkbz
Aliases CVE-2021-36398
GHSA-786g-xv8v-9h93
Summary Moodle Cross-site Scripting vulnerability In Moodle, ID numbers displayed in the web service token list 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 0.00736 https://api.first.org/data/v1/epss?cve=CVE-2021-36398
epss 0.00736 https://api.first.org/data/v1/epss?cve=CVE-2021-36398
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-786g-xv8v-9h93
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=424804
generic_textual MODERATE https://moodle.org/mod/forum/discuss.php?d=424804
ssvc Track https://moodle.org/mod/forum/discuss.php?d=424804
cvssv3.1 5.4 https://nvd.nist.gov/vuln/detail/CVE-2021-36398
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-36398
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-36398
https://github.com/moodle/moodle
https://moodle.org/mod/forum/discuss.php?d=424804
https://nvd.nist.gov/vuln/detail/CVE-2021-36398
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-786g-xv8v-9h93 https://github.com/advisories/GHSA-786g-xv8v-9h93
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=424804
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/2025-03-07T18:57:56Z/ Found at https://moodle.org/mod/forum/discuss.php?d=424804
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-2021-36398
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 0.71803
EPSS Score 0.00736
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:15:11.953924+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-786g-xv8v-9h93/GHSA-786g-xv8v-9h93.json 36.1.3