CVE-2026-102577 PUBLISHED

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

Assigner: fedora
Reserved: 29.09.2026 Published: 30.09.2026 Updated: 30.09.2026

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).

Metrics

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

Product Status

Package Collection https://git.moodle.org
Package Name moodle
Versions Default: unaffected
  • affected from 5.2.0 to 5.2.2 (excl.)
  • affected from 5.1.0 to 5.1.6 (excl.)
  • affected from 5.0.0 to 5.0.9 (excl.)
  • affected from 0 to 4.5.13 (excl.)

Credits

  • Upstream acknowledges Kaique Costa as the original reporter.

References

Problem Types

  • Server-Side Request Forgery (SSRF) CWE