VULNERABILITY INTELLIGENCE

CVE-2018-18531

CVSS score9.8 CRITICAL
EPSS probability1.47%
CISA KEVNot currently listed
Published2018-10-19
Last modified2026-06-17
CVSS vectorCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

text/impl/DefaultTextCreator.java, text/impl/ChineseTextProducer.java, and text/impl/FiveLetterFirstNameTextCreator.java in kaptcha 2.3.2 use the Random (rather than SecureRandom) function for generating CAPTCHA values, which makes it easier for remote attackers to bypass intended access restrictions via a brute-force approach.

Weakness classification

  • CWE-330: Use of Insufficiently Random Values

Primary references