XSS in Chamilo Chamilo-Lms
CVE-2025-55289
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (20.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Chamilo Chamilo-Lms — versions < 1.11.34
- Chamilo Lms
Weakness classification (CWE)
References
- github.com/chamilo/chamilo-lms/security/advisories/GHSA-cchj-3qmf-82j5 (Vendor Advisory)
- github.com/chamilo/chamilo-lms/releases/tag/v1.11.34 (Product, Release Notes)
Frequently asked questions
- What is CVE-2025-55289?
- CVE-2025-55289 is a high-severity vulnerability in Chamilo Chamilo-Lms, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-03-06.
- How severe is CVE-2025-55289?
- High severity. CVSS v3 base score is 8.8 out of 10.