What’s Vulnerable › Vulnerabilities

CVE-2025-3643: Moodle: reflected xss risk in policy tool

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-25 · updated 2026-06-17
• Weakness: CWE-79

Description

A flaw was found in Moodle. The return URL in the policy tool required additional sanitizing to prevent a reflected Cross-site scripting (XSS) risk.

Affected products

• Moodle: before 4.1.18; from 4.3.0 before 4.3.12; from 4.4.0 before 4.4.8; from 4.5.0 before 4.5.4 — fixed in 4.1.18, 4.3.12, 4.4.8, 4.5.4

How to fix

Upgrade to a fixed version: Moodle 4.1.18, 4.3.12, 4.4.8, 4.5.4. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/security/cve/CVE-2025-3643
• https://bugzilla.redhat.com/show_bug.cgi?id=2359742
• https://moodle.org/mod/forum/discuss.php?d=467604

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