What is the CVSS score of CVE-2026-31940?

CVE-2026-31940 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of PHP are affected by CVE-2026-31940?

Chamilo LMS versions before 1.11.38 and 2.0.0-RC.3 contain a session fixation vulnerability that allows unauthenticated attackers to hijack user sessions and gain unauthorized access to student…. A patch is available.

How to fix or mitigate CVE-2026-31940?

Within 24 hours: Identify all Chamilo LMS instances in production and document current versions. Within 7 days: Upgrade Chamilo to version 1.11.38 or later (for 1.x branch) or 2.0.0-RC.3 or later (for 2.0 branch); test in staging environment first. Within 30 days: Verify all instances have been patched, conduct session audit to identify any unauthorized access, and review access logs for exploitation attempts targeting main/lp/aicc_hacp.php.

PHP CVE-2026-31940

EUVD-2026-21522 HIGH

Session Fixation (CWE-384)

2026-04-10 GitHub_M

PHP Information Disclosure Session Fixation

7.5

CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Re-analysis Queued

Apr 17, 2026 - 21:37 vuln.today

cvss_changed

Analysis Updated

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

executive_summary

Re-analysis Queued

Apr 16, 2026 - 05:29 backfill_euvd_patch

patch_released

Patch available

Apr 16, 2026 - 05:29 EUVD

2.0.0-RC.3,1.11.38

EUVD ID Assigned

Apr 10, 2026 - 18:00 euvd

EUVD-2026-21522

Analysis Generated

Apr 10, 2026 - 18:00 vuln.today

CVE Published

Apr 10, 2026 - 17:35 nvd

HIGH 7.5

DescriptionNVD

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.

AnalysisAI

Session fixation in Chamilo LMS versions prior to 1.11.38 and 2.0.0-RC.3 enables unauthenticated remote attackers to hijack user sessions via main/lp/aicc_hacp.php. User-controlled request parameters directly manipulate PHP session IDs before application bootstrap, allowing attackers to force victims into attacker-controlled sessions. …

RemediationAI

Within 24 hours: Identify all Chamilo LMS instances in production and document current versions. Within 7 days: Upgrade Chamilo to version 1.11.38 or later (for 1.x branch) or 2.0.0-RC.3 or later (for 2.0 branch); test in staging environment first. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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CVE-2026-31940 vulnerability details – vuln.today

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PHP CVE-2026-31940

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

RemediationAI

Full analysis requires sign-in

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External POC / Exploit Code