CVE-2026-102577

A flaw was found in Moodle. Incorrect handling of IPv4-mapped IPv6 addresses within the URL downloader's host-blocking logic allows an authenticated remote user to bypass blocked-host restrictions. By supplying a crafted URL, an attacker can induce the server to make requests to restricted destinations, leading to Server-Side Request Forgery (SSRF).

Score

CVSS 3.1 4.3 Medium

Status

Analyzed - patrick@puiterwijk.org

Published

2026-09-30

Last modified

2026-10-01

Weaknesses

CWE-918

Affected products

• Moodle (Moodle)

References

• http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-88779
• https://access.redhat.com/security/cve/CVE-2026-102577
• https://bugzilla.redhat.com/show_bug.cgi?id=2543604
• https://moodle.org/mod/forum/discuss.php?d=482495