Vulnerability · Published Apr 10, 2026 · Assigned by GitHub_M

CVE-2026-33698Chamilo LMS affected by unauthenticated RCE in main/install folder

Critical 9.3

In plain English

A critical-severity security flaw in chamilo-lms from chamilo. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).

Severity (CVSS 4.0)9.3Critical

Exploit odds (30 days)0.3%top 74.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
chamilo	chamilo-lms	< 1.11.38

Weakness: CWE-552 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-557g-2w66-gpmf x_refsource_CONFIRM
https://github.com/chamilo/chamilo-lms/commit/d3355d7873c7e5b907c5fa84cbd5d9b62ed33e51 x_refsource_MISC