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.

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)

Published 2025-02-24 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.004 (27.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Moodle
Moodle Project — versions 4.5.0, 4.4.0, 4.3.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

moodle.org/mod/forum/discuss.php (vendor-advisory, Vendor Advisory)
git.moodle.org/gw (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.