CVE-2026-102577

MEDIUM 4.3

Moodle: ssrf risk in url downloader via ipv4-mapped ipv6 address bypass

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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).

CWE	CWE-918
Published	Sep 30, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Upstream acknowledges Kaique Costa as the original reporter.