CVE-2026-102585: A flaw was found in Moodle

Routine

MEDIUM 4.3UPGRADE

CVE-2026-102585 is a medium-severity flaw (CVSS 4.3) affecting moodle. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-842
Published	2026-09-30
Last modified	2026-10-01

Publisher (CNA): Fedora Project · Vendor: moodle

Last updated 2026-10-01 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-30 09:17 UTCPublished CVE record published
2026-10-01 14:47 UTCUpdated Record last modified

moodle moodle UPGRADE

Affected: >= 5.1.0 and < 5.1.6 · >= 5.2.0 and < 5.2.2

Fixed in: 5.1.6, 5.2.2

Safe to downgrade to: a release before 5.1.0

1. Check installed version

apt-cache policy moodle || rpm -q moodle || moodle --version

2. UPGRADE to 5.1.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade moodle

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade moodle

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.1.0 (Debian / Ubuntu)

apt-cache madison moodle sudo apt install moodle=<VERSION_BEFORE_5.1.0> sudo apt-mark hold moodle

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list moodle sudo dnf downgrade moodle-<VERSION_BEFORE_5.1.0> sudo dnf versionlock add moodle

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-102585?

moodle: upgrade to 5.1.6, 5.2.2. Exact commands for each OS are on this page.

Is CVE-2026-102585 being exploited?

CVE-2026-102585 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-102585 affect?

CVE-2026-102585 affects moodle. Severity is medium (CVSS 4.3). 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

How urgent is CVE-2026-102585?

Priority 18/100. No elevated risk signals yet.

Software pages

Moodle vulnerabilities

Related CVEs

CVE-2026-102588 MEDIUM 6.5 UPGRADE A flaw was found in Moodle
CVE-2026-102586 MEDIUM 4.3 UPGRADE A flaw was found in Moodle
CVE-2026-102581 MEDIUM 4.6 UPGRADE A flaw was found in Moodle
CVE-2026-102582 LOW 2.2 UPGRADE A flaw was found in Moodle
CVE-2026-102583 LOW 2.7 UPGRADE A flaw was found in Moodle

References

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