XSS in Moodle

CVE-2025-26530

The question bank filter required additional sanitizing to prevent a reflected XSS risk.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (27.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Moodle
Moodle Project — versions 4.5.0, 4.4.0, 4.3.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

patrick@puiterwijk.org (vendor-advisory, Vendor Advisory)
patrick@puiterwijk.org (Patch, patch)

Frequently asked questions

What is CVE-2025-26530?: CVE-2025-26530 is a high-severity vulnerability in Moodle, classified under Cross-site Scripting. CVSS score: 8.3/10. Published 2025-02-24.
How severe is CVE-2025-26530?: High severity. CVSS v3 base score is 8.3 out of 10.