CVE-2026-33704: CWE-434: Unrestricted Upload of File with Dangerous Type in chamilo chamilo-lms
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.
AI Analysis
Technical Summary
CVE-2026-33704 is an unrestricted file upload vulnerability in Chamilo LMS before version 1.11.38. Authenticated users can write arbitrary content to files on the server through the BigUpload endpoint by controlling the filename via the key parameter and supplying file content in the POST body. Although .php extensions are filtered to .phps, the .pht extension is not filtered and can be executed as PHP on Apache servers configured to treat .pht files as PHP scripts. This results in remote code execution. The vulnerability is fixed in Chamilo LMS version 1.11.38.
Potential Impact
The vulnerability allows authenticated users, including students, to upload files that can be executed as code on the server, leading to remote code execution. This can compromise the integrity and availability of the affected system. The CVSS score is 7.1 (high severity), reflecting the ease of exploitation and the impact on integrity and availability.
Mitigation Recommendations
Upgrade Chamilo LMS to version 1.11.38 or later, where this vulnerability is fixed. Since the vendor advisory confirms the fix in 1.11.38, applying this official update is the recommended remediation. Patch status is not explicitly stated beyond this version fix, so verify with the vendor advisory for the latest guidance.
CVE-2026-33704: CWE-434: Unrestricted Upload of File with Dangerous Type in chamilo chamilo-lms
Description
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-33704 is an unrestricted file upload vulnerability in Chamilo LMS before version 1.11.38. Authenticated users can write arbitrary content to files on the server through the BigUpload endpoint by controlling the filename via the key parameter and supplying file content in the POST body. Although .php extensions are filtered to .phps, the .pht extension is not filtered and can be executed as PHP on Apache servers configured to treat .pht files as PHP scripts. This results in remote code execution. The vulnerability is fixed in Chamilo LMS version 1.11.38.
Potential Impact
The vulnerability allows authenticated users, including students, to upload files that can be executed as code on the server, leading to remote code execution. This can compromise the integrity and availability of the affected system. The CVSS score is 7.1 (high severity), reflecting the ease of exploitation and the impact on integrity and availability.
Mitigation Recommendations
Upgrade Chamilo LMS to version 1.11.38 or later, where this vulnerability is fixed. Since the vendor advisory confirms the fix in 1.11.38, applying this official update is the recommended remediation. Patch status is not explicitly stated beyond this version fix, so verify with the vendor advisory for the latest guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-23T17:06:05.746Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d9d9721cc7ad14da3f862f
Added to database: 4/11/2026, 5:17:38 AM
Last enriched: 4/11/2026, 5:18:07 AM
Last updated: 4/11/2026, 1:55:04 PM
Views: 6
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