CVE-2026-114389CWE-639

CVE-2026-114389

Medium · published October 21, 2026

CVSS v3.1

4.3

EPSS

Percentile

18.8

In the wild

Unconfirmed

What it is

Chamilo LMS from 2.0.0-alpha.4 before 2.0.0-RC.3 contains a missing authorization vulnerability in AiController::openAnswerGrade that allows any authenticated user to obtain AI grading of other students' exam attempts. Attackers can enumerate exeId and questionId values sent to the open_answer_grade endpoint to expose other students' answers through feedback and consume AI quota.

The record

Technical detail

CVSS v3.1: 4.3 · MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0: 5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS: 0.00274 · 18.8th percentile
Weakness: CWE-639 · Authorization Bypass Through User-Controlled Key
Published: 2026-10-21T17:18Z

References (5)

https://github.com/chamilo/chamilo-lms/blob/v2.0.0-RC.2/src/CoreBundle/Controller/AiController.php#L525-L703 · [email protected]https://github.com/chamilo/chamilo-lms/commit/2861afd4896ff898a950302f2c00f44726fa6f0a · [email protected]https://github.com/chamilo/chamilo-lms/issues/7671 · [email protected]https://github.com/chamilo/chamilo-lms/releases/tag/v2.0.0-RC.3 · [email protected]https://www.vulncheck.com/advisories/chamilo-lms-2.0.0-alpha.4-before-2.0.0-rc.3-missing-authorization-via-openanswergrade · [email protected]

EPSS history

Timeline

23 OCT 03:55Z
EPSS moved — → 0%
epss
21 OCT 12:39Z
Chamilo LMS 2.0.0-alpha.4 before 2.0.0-RC.3 Missing Authorization via openAnswerGrade
cvelistv5
21 OCT 12:39Z
Chamilo LMS 2.0.0-alpha.4 before 2.0.0-RC.3 Missing Authorization via openAnswerGrade
cvelistv5