What is CVE-2025-3636?

CVE-2025-3636 is a medium-severity vulnerability in Moodle, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2025-04-25.

How severe is CVE-2025-3636?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Is CVE-2025-3636 known to be exploited?

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

Auth bypass in Moodle

CVE-2025-3636

A flaw was found in Moodle. This vulnerability allows unauthorized users to access and view RSS feeds due to insufficient capability checks.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2025-04-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (23.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.7% 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

Moodle

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

Public proof-of-concept exploits

References

git.moodle.org/gw (Patch)
access.redhat.com/security/cve/CVE-2025-3636 (Third Party Advisory, vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking)

Frequently asked questions

What is CVE-2025-3636?: CVE-2025-3636 is a medium-severity vulnerability in Moodle, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2025-04-25.
How severe is CVE-2025-3636?: Medium severity. CVSS v3 base score is 4.3 out of 10.
Is CVE-2025-3636 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.