CVE-2025-55289 Chamilo: Stored Cross Site Scripting in Skills Argumentation
Attackers can inject malicious scripts into Chamilo LMS social and messaging features, leading to session hijacking and account takeover for authenticated users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-55289?
CVE-2025-55289 is a high-severity cross-site scripting vulnerability in Chamilo Chamilo Lms, published on 6 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Chamilo is a learning management system. Prior to version 1.11.34, there is a stored XSS vulnerability in Chamilo LMS (Verison 1.11.32) allows an attacker to inject arbitrary JavaScript into the platform’s social network and internal messaging features. When viewed by an authenticated user (including administrators), the payload executes in their browser within the LMS context. This enables full account takeover via session hijacking, unauthorized actions with the victim’s privileges, exfiltration of sensitive data, and potential self-propagation to other users. This issue has been patched in version 1.11.34.
Weakness: CWE-79
Which versions are affected by CVE-2025-55289?
It affects 1 product.
Products include Chamilo Chamilo Lms.
How do I fix CVE-2025-55289?
No fix has been published for CVE-2025-55289 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-55289 being exploited?
There is no known exploitation of CVE-2025-55289 in the wild and no public exploit code.
Other vulnerabilities in Chamilo Chamilo Lms
Sources
Also known as GHSA-cchj-3qmf-82j5.