Cross-site scripting in Chamilo LMS - CVE-2026-34161
Published: April 24, 2026
Vulnerability identifier: #VU127570
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-34161
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Chamilo
Affected software:
Chamilo LMS
Chamilo LMS
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary JavaScript in the victim's browser.
The vulnerability exists due to cross-site scripting in the social post attachment upload functionality when rendering uploaded attachment content via the generated contentUrl. A remote user can upload a malicious HTML file containing JavaScript to execute arbitrary JavaScript in the victim's browser.
User interaction is required when a user accesses the malicious attachment link.
How to mitigate CVE-2026-34161
Install security update from vendor's website.