What is the CVSS score of EUVD-2026-21559?

EUVD-2026-21559 has a CVSS 3.1 base score of 7.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N. EPSS exploitation probability: 0.0%.

How to fix or mitigate EUVD-2026-21559?

Within 24 hours: Identify all Chamilo LMS deployments and confirm versions below 1.11.38. Within 7 days: Apply vendor patch to upgrade Chamilo to version 1.11.38 or later; audit REST API key distribution and revoke unnecessary keys from student accounts. Within 30 days: Review audit logs for suspicious status changes via update_user_from_username endpoint (2+ months prior) and verify no unauthorized courses were created; enforce role-based access controls limiting REST API key issuance to administrative users only.

Chamilo Lms EUVD-2026-21559

Q: Which versions of Chamilo Lms are affected by EUVD-2026-21559?

Chamilo LMS versions before 1.11.38 contain a privilege escalation vulnerability allowing authenticated users to self-promote from student to teacher status via REST API manipulation, enabling…. A patch is available.

| CVE-2026-33706 HIGH

Improper Privilege Management (CWE-269)

2026-04-10 security-advisories@github.com

Privilege Escalation Chamilo Lms Chamilo

7.1

CVSS 3.1 · Vendor: github

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Authenticate with valid REST API key
Exploit

Call update_user_from_username endpoint
Execution

Modify status field from 5 to 1
Impact

Gain teacher and course management privileges

Vulnerability Assessment

Weakness	CWE CWE-269 OWASP Top 10:2025 A06:2025 - Insecure Design ASVS 5.0 V8 - Authorization Least privilege enforcement MITRE ATT&CK 1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Attacker must be an authenticated Chamilo LMS user (any role) with a valid REST API key. Affects versions prior to 1.11.38. No victim interaction required. Attacker directly calls update_user_from_username endpoint to escalate their status from student to teacher/course manager.
Impact	Authenticated privilege escalation via REST API allows students to self-promote to teacher status, gaining course creation and management capabilities. CVSS 7.1 reflects high integrity impact; EPSS data unavailable. Blast radius limited to organizations running vulnerable Chamilo versions without API key rotation controls. Requires valid API credentials but enables persistent unauthorized administrative access.
Exploit ScenarioDerived	Authenticated attacker with REST API key calls update_user_from_username endpoint with modified status field (5→1). Single HTTP request escalates student account to teacher role. No public exploit code identified at time of analysis.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Apr 10, 2026

Privilege escalation in Chamilo LMS versions prior to 1.11.38 allows any authenticated user with a REST API key to elevate their account status from student (status=5) to teacher/course manager (status=1) by manipulating the status field through the update_user_from_username REST API endpoint. This enables unauthorized course creation and management capabilities. Authentication is required (PR:L), but once exploited, attackers gain high-integrity administrative functions within the learning management system. No public exploit identified at time of analysis.

RemediationAI

Vendor-released patch: upgrade to Chamilo LMS version 1.11.38 or later, which implements proper authorization checks on the update_user_from_username endpoint to prevent unauthorized status field modifications. The fix is available via commit 0acf8a196307c66c049f97f5ff76cf21c4a08127. Until patching, disable REST API access for untrusted users or revoke all student-level API keys. Review audit logs for unauthorized status changes (student accounts elevated to status=1). Official advisory: https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-3gqc-xr75-pcpw. Verify no privilege escalation has occurred before applying the patch by auditing user status fields in the database.

Affected VersionsENISA

chamilo-lms < 1.11.38

Affected Packages

euvd chamilo_lms fix: 1.11.38

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Root cause is improper privilege management (CWE-269) in the REST API's update_user_from_username endpoint. The API fails to validate whether the authenticated user has authorization to modify sensitive account attributes like the status field, allowing low-privileged users to perform status-changing operations reserved for administrators. Network-accessible (AV:N) with low attack complexity (AC:L).

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (github) PRIMARY 7.1 HIGH

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

Primary rating from Vendor (github) · only source for this CVE.

CVSS VectorVendor: github

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Updated

Apr 16, 2026 - 05:58 EUVD-patch-fix

executive summary

Patch available

Apr 16, 2026 - 05:29 EUVD

1.11.38

CVE Published

Apr 10, 2026 - 19:16 nvd

HIGH 7.1

DescriptionCVE.org

Chamilo LMS is a learning management system. Prior to 1.11.38, any authenticated user with a REST API key can modify their own status field via the update_user_from_username endpoint. A student (status=5) can change their status to Teacher/CourseManager (status=1), gaining course creation and management privileges. This vulnerability is fixed in 1.11.38.

Executive ViewAI

Why It Matters

Chamilo LMS versions before 1.11.38 contain a privilege escalation vulnerability allowing authenticated users to self-promote from student to teacher status via REST API manipulation, enabling unauthorized course creation and institutional control of learning content. Organizations running affected Chamilo instances face loss of administrative integrity and potential compromise of course materials and student data by insider threats or compromised user accounts.

Business Impact: High

Compensating Controls

Apply vendor patch. Interim: Disable REST API access for student-role accounts; restrict update_user_from_username endpoint to administrative IP ranges and require multi-factor authentication for API key usage; implement API request logging and alerting on status field modifications.

Threat Intelligence Overview

EPSS Score

0.0%

Top 93% exploitable

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision

Scheduled

Exploitation

None

System Exposure· derived

Open

Automatable

Human Impact

High

Technical Impact

Partial

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +36

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.