CVE-2026-33704
HIGHChamilo LMS Affected by Authenticated Arbitrary File Write via BigUpload endpoint
Title source: cnaDescription
Chamilo LMS is a learning management system. Prior to 1.11.38, any authenticated user (including students) can write arbitrary content to files on the server via the BigUpload endpoint. The key parameter controls the filename and the raw POST body becomes the file content. While .php extensions are filtered to .phps, the .pht extension passes through unmodified. On Apache configurations where .pht is handled as PHP, this leads to Remote Code Execution. This vulnerability is fixed in 1.11.38.
References (2)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-phfx-pwwg-945v
X_Refsource_Misc x_refsource_misc
https://github.com/chamilo/chamilo-lms/commit/9748f1ffbdb8b6dc84c0e0591c9d3c1d92e21c00
Scores
CVSS v3
7.1
EPSS
0.0042
EPSS Percentile
33.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-434
Status
published
Products (2)
chamilo/chamilo-lms
< 1.11.38
chamilo/chamilo_lms
< 1.11.38
Published
Apr 10, 2026
Tracked Since
Apr 11, 2026