What is CVE-2025-26529?

CVE-2025-26529 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-2025-26529?

High severity. CVSS v3 base score is 8.3 out of 10.

Is CVE-2025-26529 known to be exploited?

6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Moodle

CVE-2025-26529

Description information displayed in the site administration live log required additional sanitizing to prevent a stored 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: 0.005 (41.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · 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

Public proof-of-concept exploits

References

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

Frequently asked questions

What is CVE-2025-26529?: CVE-2025-26529 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-2025-26529?: High severity. CVSS v3 base score is 8.3 out of 10.
Is CVE-2025-26529 known to be exploited?: 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.