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Vulnerability details: VCID-x1yz-usr2-xucj
Vulnerability ID VCID-x1yz-usr2-xucj
Aliases CVE-2021-43560
GHSA-g39c-mccf-rxjv
Summary Moodle Insecure direct object reference (IDOR) in a calendar web service A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. Insufficient capability checks made it possible to fetch other users' calendar action events.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-668 Exposure of Resource to Wrong Sphere
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 0.00308 https://api.first.org/data/v1/epss?cve=CVE-2021-43560
epss 0.00308 https://api.first.org/data/v1/epss?cve=CVE-2021-43560
cvssv3.1 5.3 https://bugzilla.redhat.com/show_bug.cgi?id=2021519
generic_textual MODERATE https://bugzilla.redhat.com/show_bug.cgi?id=2021519
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-g39c-mccf-rxjv
cvssv3.1 5.3 https://github.com/moodle/moodle
generic_textual MODERATE https://github.com/moodle/moodle
cvssv3.1 5.3 https://moodle.org/mod/forum/discuss.php?d=429100
generic_textual MODERATE https://moodle.org/mod/forum/discuss.php?d=429100
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2021-43560
cvssv3.1 5.3 https://nvd.nist.gov/vuln/detail/CVE-2021-43560
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-43560
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-43560
https://bugzilla.redhat.com/show_bug.cgi?id=2021519
https://github.com/moodle/moodle
https://moodle.org/mod/forum/discuss.php?d=429100
https://nvd.nist.gov/vuln/detail/CVE-2021-43560
cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:7.0:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
GHSA-g39c-mccf-rxjv https://github.com/advisories/GHSA-g39c-mccf-rxjv
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://bugzilla.redhat.com/show_bug.cgi?id=2021519
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:N/S:U/C:L/I:N/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:N/S:U/C:L/I:N/A:N Found at https://moodle.org/mod/forum/discuss.php?d=429100
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: AV:N/AC:L/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43560
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43560
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 0.53477
EPSS Score 0.00308
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:27:18.428477+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-g39c-mccf-rxjv/GHSA-g39c-mccf-rxjv.json 36.1.3