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).

CVSS 3.1

4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 15% of CVEs (scores of 2026-10-25)

CWE

CWE-918

Published

2026-09-30

Modified

2026-10-01

Record from

the NVD, synced 2026-10-19

Affected

• 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

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