high CVSS 7.5

CVE-2026-32931·PHP vulnerability

Chamilo LMS is a learning management system. Prior to 1.11.38 and 2.0.0-RC.3, an unrestricted file upload vulnerability in the exercise sound upload function allows an authenticated teacher to upload a PHP webshell by spoofing the Content-Type header to audio/mpeg. The uploaded file retains its original .php extension and is placed in a web-accessible directory, enabling Remote Code Execution as the web server user (www-data). This vulnerability is fixed in 1.11.38 and 2.0.0-RC.3.

Severity
high
Software
PHP
Fixed in
1.11.38
Published
2026-04-10

Affected versions

Until: 1.11.38

Fixed in: 1.11.38

How to fix this CVE

Update PHP to version 1.11.38 or later to patch the file upload validation bypass in Chamilo LMS. This vulnerability allows authenticated teachers to upload executable PHP files by manipulating Content-Type headers, leading to remote code execution. Ensure your installation uses the patched release and verify file upload restrictions are properly enforced.

sudo dnf update php

Defensia detects this vulnerability

What an exploitation attempt looks like

Sample log line indicative of exploitation attempts:

POST /exercise.*upload.*Content-Type: audio/mpeg.*\.php|grep -E 'exercise.*upload|multipart.*audio/mpeg' /var/log/apache2/access.log | grep -i '\.php'

WAF mitigation (if patching is not yet possible)

Add this rule to your WAF to block exploitation attempts while you schedule the patch. 

Block POST requests to exercise upload endpoints that contain Content-Type: audio/mpeg with file extensions other than .mp3, .wav, or .m4a. Implement strict file type validation on the server side and reject requests where the declared MIME type does not match the file extension.

How to check if you are affected

  1. Check installed PHP version with: php -v
  2. Verify Chamilo LMS version in your installation directory or admin dashboard (Settings > Platform Administration > System Information)
  3. Review web server access logs for POST requests to /exercise or upload endpoints: grep -i 'exercise.*upload\|POST.*upload' /var/log/apache2/access.log
  4. Confirm the fix by checking if file type validation occurs before saving: test uploading a .php file with audio/mpeg Content-Type; it should be rejected or sanitized

FAQ

What is CVE-2026-32931?

This vulnerability affects Chamilo LMS and involves improper file upload validation in the exercise sound upload function, where attackers can bypass MIME type checks by spoofing the Content-Type header to upload PHP webshells with executable permissions.

Is CVE-2026-32931 being actively exploited?

No, CVE-2026-32931 is not listed in the CISA KEV catalog and no public exploits are currently available, though the attack vector is straightforward for authenticated teachers.

What versions of PHP are affected by CVE-2026-32931?

Chamilo LMS versions prior to 1.11.38 and before 2.0.0-RC.3 are vulnerable; upgrade to 1.11.38 or later to remediate.

How do I check if my server is vulnerable to CVE-2026-32931?

Run php -v to confirm your version, then check Chamilo's version in the admin interface. If Chamilo is below 1.11.38, the system is vulnerable to this file upload bypass.

Does Defensia detect CVE-2026-32931?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If PHP is installed on a monitored server, CVE-2026-32931 will appear in your dashboard with remediation steps.

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References

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