CVE-2026-33736Network attack vector

Authenticated user-data disclosure via permissive API authorization

Published Apr 10, 2026 · Updated Apr 10, 2026

Information disclosure in Chamilo LMS before 2.0.0-RC.3 allows remote authenticated users to read all users' personal data via the user API. The GET /api/users collection operation admits every registered account through its ROLE_USER check and serializes email, phone, and role fields without record-level restrictions. A student account is sufficient to enumerate administrator and other user records; no data modification or service interruption is reported.

CVSS severity6.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Chamilo LMS before 2.0.0-RC.3 allows remote authenticated users to read all users' personal data via the user API. The GET /api/users collection operation admits every registered account through its ROLE_USER check and serializes email, phone, and role fields without record-level restrictions. A student account is sufficient to enumerate administrator and other user records; no data modification or service interruption is reported.

The record

CVE
CVE-2026-33736
Published
Apr 10, 2026
Updated
Apr 10, 2026
Vendor
Chamilo
Product
Chamilo LMS
Classifications
CWE-639, T1087
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.0.0-alpha.1, < 2.0.0-RC.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Chamilo · Chamilo LMSversion=>= 2.0.0-alpha.1, < 2.0.0-RC.3

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1087Account Discovery

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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