Chamilo LMS up to 1.11.35 AJAX Endpoint Database::escape_string sql injection

Summaryinfo

A vulnerability categorized as critical has been discovered in Chamilo LMS up to 1.11.35. The affected element is the function Database::escape_string of the component AJAX Endpoint. The manipulation results in sql injection. This vulnerability is cataloged as CVE-2026-30881. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Chamilo LMS up to 1.11.35. Affected is the function Database::escape_string of the component AJAX Endpoint. The manipulation with an unknown input leads to a sql injection vulnerability. CWE is classifying the issue as CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Chamilo LMS is a learning management system. Version 1.11.34 and prior contains a SQL Injection vulnerability in the statistics AJAX endpoint. The parameters date_start and date_end from $_REQUEST are embedded directly into a raw SQL string without proper sanitization. Although Database::escape_string() is called downstream, its output is immediately neutralized by str_replace("\'", "'", ...), which restores any injected single quotes — effectively bypassing the escaping mechanism entirely. This allows an authenticated attacker to inject arbitrary SQL statements into the database query, enabling blind time-based and conditional data extraction. This issue has been patched in version 1.11.36.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-30881 since 03/06/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1505.

Upgrading to version 1.11.36 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-12500). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Content Management System

Vendor

• Chamilo

Name

• LMS

Version

• 1.11.0
• 1.11.1
• 1.11.2
• 1.11.3
• 1.11.4
• 1.11.5
• 1.11.6
• 1.11.7
• 1.11.8
• 1.11.9
• 1.11.10
• 1.11.11
• 1.11.12
• 1.11.13
• 1.11.14
• 1.11.15
• 1.11.16
• 1.11.17
• 1.11.18
• 1.11.19
• 1.11.20
• 1.11.21
• 1.11.22
• 1.11.23
• 1.11.24
• 1.11.25
• 1.11.26
• 1.11.27
• 1.11.28
• 1.11.29
• 1.11.30
• 1.11.31
• 1.11.32
• 1.11.33
• 1.11.34
• 1.11.35

License

• open-source

CPE 2.3info

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CPE 2.2info

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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