by Michael Hawkins. Insufficient checks on a confirmation email web service made it easier to brute force password checks against known usernames. Severity/Risk: Minor Versions affected: 5.1, 5.0 to 5.0.3, 4.5 to 4.5.7, 4.4 to 4.4.11, 4.1 to 4.1.21 and earlier unsupported versions Versions fixed: 5.1.1, 5.0.4, 4.5.8, 4.4.12 and 4.1.22 Reported by: Petr Skoda CVE identifier: CVE-2025-67853 Changes (main): http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-86326 Tracker issue: MDL-86326 Password brute force risk from confirmation email web service