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Vulnerability details: VCID-n7d3-j3jn-rqfc
Vulnerability ID VCID-n7d3-j3jn-rqfc
Aliases CVE-2021-32478
GHSA-78fm-qhh8-8858
Summary Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') The redirect URI in the LTI authorization endpoint required extra sanitizing to prevent reflected XSS and open redirect risks. Moodle versions 3.10 to 3.10.3, 3.9 to 3.9.6, 3.8 to 3.8.8 and earlier unsupported versions are affected.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
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
System Score Found at
epss 0.03402 https://api.first.org/data/v1/epss?cve=CVE-2021-32478
cvssv3.1 6.1 https://github.com/moodle/moodle/commit/752ad3d8eb4f9ac22dbf1461aa69d6e0baee503e
generic_textual MODERATE https://github.com/moodle/moodle/commit/752ad3d8eb4f9ac22dbf1461aa69d6e0baee503e
cvssv3.1 6.1 https://moodle.org/mod/forum/discuss.php?d=422314
generic_textual MODERATE https://moodle.org/mod/forum/discuss.php?d=422314
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2021-32478
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-32478
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-32478
https://github.com/moodle/moodle/commit/752ad3d8eb4f9ac22dbf1461aa69d6e0baee503e
https://moodle.org/mod/forum/discuss.php?d=422314
CVE-2021-32478 https://nvd.nist.gov/vuln/detail/CVE-2021-32478
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/moodle/moodle/commit/752ad3d8eb4f9ac22dbf1461aa69d6e0baee503e
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:R/S:C/C:L/I:L/A:N Found at https://moodle.org/mod/forum/discuss.php?d=422314
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:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-32478
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 0.87638
EPSS Score 0.03402
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-02T04:41:46.179893+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/moodle/moodle/CVE-2021-32478.yml 38.6.0