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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-102577
StatePUBLISHED
Assignerfedora
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-30 09:17:14 UTC
Updated2026-09-30 16:20:44 UTC
DescriptionA 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).

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

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

Problem Types: CWE-918 | CWE-918 Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1CNACVSS4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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

References

ReferenceSourceLinkTags
git.moodle.org/gw [email protected] git.moodle.org
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
access.redhat.com/security/cve/CVE-2026-102577 [email protected] access.redhat.com
moodle.org/mod/forum/discuss.php [email protected] moodle.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Upstream acknowledges Kaique Costa as the original reporter. (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-09-09T13:08:58.000ZReported to Red Hat.
CNA2026-09-29T20:17:12.000ZMade public.

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