Critical severity · published Apr 10, 2026
CVE-2026-33698
Chamilo LMS affected by unauthenticated RCE in main/install folder
9.8
CVSS
0.3%
EPSS
No
On KEV
Description
Chamilo LMS is a learning management system. Prior to 1.11.38, a chained attack can enable otherwise-blocked PHP code from the main/install/ directory and allow an unauthenticated attacker to modify existing files or create new files where allowed by system permissions. This only affects portals with the main/install/ directory still present and read-accessible. This vulnerability is fixed in 1.11.38.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CH
chamilo-lms · chamilo
< 1.11.38 · source: vendor
CL
Chamilo Lms · Chamilo
before 1.11.38 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33698
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33698
Patch
https://github.com/chamilo/chamilo-lms/commit/d3355d7873c7e5b907c5fa84cbd5d9b62ed33e51
Vendor Advisory
https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-557g-2w66-gpmf
More from chamilo-lms
9.8
CVE-2026-45140
Chamilo LMS CStudio upload flow allows unauthenticated remote code execution
9.8
CVE-2026-33707
Weak Password Recovery Mechanism for Forgotten Password in chamilo/chamilo-lms
9.8
CVE-2026-28430
Chamilo LMS Vulnerable to Unauthenticated SQL Injection in chamiko-lms model.ajax.php
9.8
CVE-2025-52998
Chamilo is a learning management system
9.8
CVE-2025-50192
Chamilo is a learning management system