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Vulnerability · Published Sep 30, 2026 · Assigned by fedora

CVE-2026-102577Moodle: ssrf risk in url downloader via ipv4-mapped ipv6 address bypass

Medium 4.3

In plain English

A medium-severity server-side request forgery in moodle. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.2%top 84.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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).

Affected products (as reported)

VendorProductVersions
moodle 5.2.0 – before 5.2.25.1.0 – before 5.1.65.0.0 – before 5.0.90 – before 4.5.13

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References