Chamilo LMS up to 1.11.37/2.0.0-RC.2 Request Parameter main/lp/aicc_hacp.php session fixiation

Summaryinfo

A vulnerability classified as critical was found in Chamilo LMS up to 1.11.37/2.0.0-RC.2. The affected element is an unknown function of the file main/lp/aicc_hacp.php of the component Request Parameter Handler. Such manipulation leads to session fixiation. This vulnerability is documented as CVE-2026-31940. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Chamilo LMS up to 1.11.37/2.0.0-RC.2 and classified as critical. Affected by this issue is an unknown function of the file main/lp/aicc_hacp.php of the component Request Parameter Handler. The manipulation with an unknown input leads to a session fixiation vulnerability. Using CWE to declare the problem leads to CWE-384. Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Chamilo LMS is a learning management system. Prior to 1.11.38 and 2.0.0-RC.3, in main/lp/aicc_hacp.php, user-controlled request parameters are directly used to set the PHP session ID before loading global bootstrap. This leads to session fixation. This vulnerability is fixed in 1.11.38 and 2.0.0-RC.3.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-31940 since 03/10/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

By approaching the search of inurl:main/lp/aicc_hacp.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 1.11.38 or 2.0.0-RC.3 eliminates this vulnerability.

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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
• 1.11.36
• 1.11.37
• 2.0.0-RC.0
• 2.0.0-RC.1
• 2.0.0-RC.2

License

• open-source

CPE 2.3info

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CPE 2.2info

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