Critical severity · published Mar 5, 2026
CVE-2025-55208
Chamilo LMS has Stored Cross Site Scripting on Social Networks Uploaded Files
9.0
CVSS
0.3%
EPSS
No
On KEV
Description
Chamilo is a learning management system. Versions prior to 1.11.34 have a Stored XSS through insecure file uploads in `Social Networks`. Through it, a low-privilege user can execute arbitrary code in the admin user inbox, allowing takeover of the admin account. Version 1.11.34 fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
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
< 1.11.34 · source: vendor
CL
Chamilo Lms · Chamilo
before 1.11.34 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-55208
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-55208
Vendor Advisory
https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-2vq2-826h-6hp6
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