CVE-2026-102577

EUVD-2026-89716
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).
SSRF
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
4.3 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 16.06%
Affected Products (NVD)
VendorProductVersion
moodlemoodle
𝑥
< 4.5.13
moodlemoodle
5.0.0 ≤
𝑥
< 5.0.9
moodlemoodle
5.1.0 ≤
𝑥
< 5.1.6
moodlemoodle
5.2.0 ≤
𝑥
< 5.2.2
𝑥
= Vulnerable software versions
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
moodle
bionic
needs-triage
jammy
dne
noble
dne
resolute
dne
xenial
needs-triage
Common Weakness Enumeration
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