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Vulnerability details: VCID-4xhe-xv4a-3kbx
Vulnerability ID VCID-4xhe-xv4a-3kbx
Aliases CVE-2021-40691
GHSA-92vh-mr2w-j2cr
Summary Moodle Improper Authentication A session hijack risk was identified in the Shibboleth authentication plugin.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (2)
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 0.00181 https://api.first.org/data/v1/epss?cve=CVE-2021-40691
epss 0.00181 https://api.first.org/data/v1/epss?cve=CVE-2021-40691
cvssv3.1 4.3 https://bugzilla.redhat.com/show_bug.cgi?id=2043411
generic_textual MODERATE https://bugzilla.redhat.com/show_bug.cgi?id=2043411
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-92vh-mr2w-j2cr
cvssv3.1 4.3 https://github.com/moodle/moodle
generic_textual MODERATE https://github.com/moodle/moodle
cvssv3.1 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-40691
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-40691
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-40691
https://bugzilla.redhat.com/show_bug.cgi?id=2043411
https://github.com/moodle/moodle
https://nvd.nist.gov/vuln/detail/CVE-2021-40691
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-92vh-mr2w-j2cr https://github.com/advisories/GHSA-92vh-mr2w-j2cr
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N Found at https://bugzilla.redhat.com/show_bug.cgi?id=2043411
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: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:R/S:U/C:N/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-40691
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 0.40269
EPSS Score 0.00181
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:23:17.945960+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/09/GHSA-92vh-mr2w-j2cr/GHSA-92vh-mr2w-j2cr.json 36.1.3