What is the CVSS score of CVE-2025-52998?

CVE-2025-52998 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2025-52998?

Within 24 hours: Identify all Chamilo instances and document current versions; assess internet exposure and isolate affected systems if possible. Within 7 days: Apply vendor patch to version 1.11.30 or later on all Chamilo deployments; validate patch installation and verify system functionality. Within 30 days: Conduct forensic review for unauthorized access or data exfiltration; review access logs from the vulnerability window; implement network segmentation to limit LMS lateral movement.

Chamilo CVE-2025-52998

Q: Which versions of Chamilo are affected by CVE-2025-52998?

Chamilo learning management systems prior to version 1.11.30 contain a critical vulnerability allowing remote code execution through unsafe deserialization.. A patch is available.

CRITICAL

Deserialization of Untrusted Data (CWE-502)

2026-03-02 security-advisories@github.com

Deserialization Chamilo Lms Chamilo

9.8

CVSS 3.1 · GitHub Advisory

View

Vulnerability Assessment

Weakness	CWE CWE-502 OWASP Top 10:2025 A08:2025 - Software or Data Integrity Failures ASVS 5.0 V1 - Encoding and Sanitization Safe deserialization, type allowlists MITRE ATT&CK 2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS 9.8 with patch. Chamilo has five critical vulnerabilities across code injection, SQL injection, SSRF, and deserialization.
Exploit ScenarioDerived	An attacker sends crafted serialized data that executes arbitrary PHP code when deserialized.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Chamilo LMS prior to 1.11.30 has an insecure deserialization vulnerability enabling remote code execution through crafted serialized data.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 9.8

Insecure deserialization in Chamilo LMS enables RCE.

RemediationAI

Update Chamilo to 1.11.30+ which addresses all five vulnerabilities.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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

Technical ContextAI · show details

Chamilo < 1.11.30 has a CWE-502 deserialization vulnerability. Fifth critical Chamilo vulnerability in the advisory batch.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 9.8 CRITICAL

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Mar 03, 2026 - 18:21 nvd

Patch available

CVE Published

Mar 02, 2026 - 16:16 nvd

CRITICAL 9.8

DescriptionGitHub Advisory

Chamilo is a learning management system. Prior to version 1.11.30, in the application, deserialization of data is performed, the data can be spoofed. An attacker can create objects of arbitrary classes, as well as fully control their properties, and thus modify the logic of the web application's operation. This issue has been patched in version 1.11.30.

Executive ViewAI

Why It Matters

Chamilo learning management systems prior to version 1.11.30 contain a critical vulnerability allowing remote code execution through unsafe deserialization. Any organization using affected Chamilo versions faces immediate risk of unauthorized system access, data theft, and operational disruption affecting all students and staff relying on the platform.

Business Impact: Severe

Compensating Controls

Apply vendor patch. If immediate patching is impossible: (1) Implement WAF rules blocking suspicious deserialization payloads targeting Chamilo endpoints, (2) Restrict network access to Chamilo to known institutional IP ranges only, (3) Disable untrusted user registration and guest access features, (4) Increase monitoring and alerting for unusual process execution on Chamilo servers.

Threat Intelligence Overview

EPSS Score

0.1%

Top 67% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

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 CRITICAL

CISA KEV No

Public POC No

EPSS 0.1%

Patch available Yes

Active threat No

Deciding rule

CRITICAL severity

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· derived

Out-of-Cycle

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +49

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Insecure Deserialization CRITICAL

Insecure deserialization occurs when an application converts serialized data (a stream of bytes representing an object's state) back into a living object without proper validation.