CVE-2026-102585

MEDIUM 4.3

Moodle: group validation missing when enrolling user to course

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

A flaw was found in Moodle. When enrolling a user into a course while assigning them to a group, the application does not verify whether the selected group actually belongs to that course. An authenticated user with teacher privileges could exploit this flaw to add users to groups within courses they do not have authorization to access.

CWE	CWE-842
Published	Sep 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

References

NVD ↗ CVE.org ↗ EPSS Data ↗

git.moodle.org: http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-88538 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-102585 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2543639 moodle.org: https://moodle.org/mod/forum/discuss.php?d=482503

Credits

Upstream acknowledges Paul Holden as the original reporter.