CVE-2026-33736: Chamilo LMS is a learning management system

Routine

MEDIUM 6.5DOWNGRADE

CVE-2026-33736 is a medium-severity flaw (CVSS 6.5) affecting chamilo lms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Chamilo LMS is a learning management system. Prior to 2.0.0-RC.3, any authenticated user (including ROLE_STUDENT) can enumerate all platform users and access personal information (email, phone, roles) via GET /api/users, including administrator accounts. This vulnerability is fixed in 2.0.0-RC.3.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-639
Published	2026-04-10
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: chamilo

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-10 19:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

chamilo chamilo lms DOWNGRADE

Affected: 2.0.0 alpha1 · 2.0.0 alpha2 · 2.0.0 alpha3 · 2.0.0 alpha4 · 2.0.0 alpha5 · 2.0.0 beta1 · 2.0.0 beta2 · 2.0.0 beta3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy chamilo-lms || rpm -q chamilo-lms || chamilo-lms --version

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison chamilo-lms sudo apt install chamilo-lms=<VERSION_BEFORE_2.0.0> sudo apt-mark hold chamilo-lms

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list chamilo-lms sudo dnf downgrade chamilo-lms-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add chamilo-lms

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-2026-33736?

chamilo lms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-33736 being exploited?

CVE-2026-33736 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-2026-33736 affect?

CVE-2026-33736 affects chamilo lms. Severity is medium (CVSS 6.5). Chamilo LMS is a learning management system. Prior to 2.0.0-RC.3, any authenticated user (including ROLE_STUDENT) can enumerate all platform users and access personal information (email, phone, roles) via GET /api/users, including administr

How urgent is CVE-2026-33736?

Priority 25/100. No elevated risk signals yet.

Related CVEs

CVE-2026-32894 HIGH 7.1 UPGRADE Chamilo LMS is a learning management system
CVE-2026-31940 HIGH 7.5 UPGRADE Chamilo LMS is a learning management system
CVE-2026-31941 HIGH 7.7 UPGRADE Chamilo LMS is a learning management system
CVE-2026-33702 HIGH 7.1 UPGRADE Chamilo LMS is a learning management system
CVE-2026-33141 MEDIUM 6.5 UPGRADE Chamilo LMS is a learning management system

References

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