What is CVE-2025-55208?

CVE-2025-55208 is a critical-severity vulnerability in Chamilo Chamilo-Lms, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2026-03-05.

How severe is CVE-2025-55208?

Critical severity. CVSS v3 base score is 9.0 out of 10.

XSS in Chamilo Chamilo-Lms

CVE-2025-55208

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-03-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (21.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.1% 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)

CWE-79 — Cross-site Scripting

References

github.com/chamilo/chamilo-lms/security/advisories/GHSA-2vq2-826h-6hp6 (Vendor Advisory)

Frequently asked questions

What is CVE-2025-55208?: CVE-2025-55208 is a critical-severity vulnerability in Chamilo Chamilo-Lms, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2026-03-05.
How severe is CVE-2025-55208?: Critical severity. CVSS v3 base score is 9.0 out of 10.