What is CVE-2025-52563?

CVE-2025-52563 is a medium-severity vulnerability in Chamilo Chamilo-Lms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-03-02.

How severe is CVE-2025-52563?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Chamilo Chamilo-Lms

CVE-2025-52563

Chamilo is a learning management system. Prior to version 1.11.30, there is a reflected cross-site scripting (XSS) vulnerability due to insufficient sanitization of the page parameter in the session/add_users_to_session.php endpoint. This issue has been patched in version 1.11.30.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-03-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (3.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Chamilo Chamilo-Lms — versions < 1.11.30
Chamilo Lms

Weakness classification (CWE)

References

github.com/chamilo/chamilo-lms/security/advisories/GHSA-h3m8-53j3-xjx8 (Vendor Advisory)
github.com/chamilo/chamilo-lms/releases/tag/v1.11.30 (Product, Release Notes)

Frequently asked questions

What is CVE-2025-52563?: CVE-2025-52563 is a medium-severity vulnerability in Chamilo Chamilo-Lms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-03-02.
How severe is CVE-2025-52563?: Medium severity. CVSS v3 base score is 6.1 out of 10.