CVE-2026-31940

Session Fixation in Chamilo LMS

7.5 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.24%Up 0.2 points since Apr 11, 2026

What each source reports

CVE List Score used 7.5

Session Fixation in Chamilo LMS

Record: CVE-2026-31940
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-384
Updated: 2026-11-02

EUVDEUVD-2026-21522 7.5

Record: EUVD-2026-21522
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

NVD 7.5

Record: CVE-2026-31940
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-384
Updated: 2026-11-02

OSV 7.5

Session Fixation in Chamilo LMS

Record: CVE-2026-31940
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-384
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-31940 is a high vulnerability (CVSS 7.5) in Chamilo Lms, published April 10, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 15th percentile. No source names a fixed version.