Moodle uses predictable password-recovery tokens

moodle/moodle Updated 02 Oct 2025

Summary

13/05/2022

Disclosed on

CVE-2015-5267

CVE

Yes i

Fix available

High

Severity

7.5

CVSS Score

CVE-2015-5267: Moodle uses predictable password-recovery tokens. Affects moodle/moodle across 3 version ranges.

< 2.7.10 >= 2.8.0, < 2.8.8 >= 2.9.0, < 2.9.2

Fixed in 2.7.10, 2.8.8 or 2.9.2, depending on the release line you run. How to fix ↓

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lib/moodlelib.php in Moodle through 2.6.11, 2.7.x before 2.7.10, 2.8.x before 2.8.8, and 2.9.x before 2.9.2 relies on the PHP mt_rand function to implement the random_string and complex_random_string functions, which makes it easier for remote attackers to predict password-recovery tokens via a brute-force approach.