CVE-2024-43438: Moodle: idor in feedback non-respondents report allows messaging arbitrary site users

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-07 · updated 2026-06-17
Weakness: CWE-639

Description

A flaw was found in Feedback. Bulk messaging in the activity's non-respondents report did not verify message recipients belonging to the set of users returned by the report.

Affected products

Moodle: from 4.1.0 before 4.1.12; from 4.2.0 before 4.2.9; from 4.3.0 before 4.3.6; from 4.4.0 before 4.4.2 — fixed in 4.1.12, 4.2.9, 4.3.6, 4.4.2

How to fix

Upgrade to a fixed version: Moodle 4.1.12, 4.2.9, 4.3.6, 4.4.2. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=2304267
https://moodle.org/mod/forum/discuss.php?d=461208

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