CVE-2018-18531

CRITICAL

kaptcha 2.3.2 - Use of Insufficiently Random Values in CAPTCHA Generation

Title source: llm

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.

References (1)

Core 1

Core References

Third Party Advisory x_refsource_misc

https://github.com/penggle/kaptcha/issues/3

Scores

CVSS v3 9.8

EPSS 0.0147

EPSS Percentile 70.3%

Attack Vector NETWORK

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE

CWE-330

Status published

Products (2)

com.github.penggle/kaptcha 0Maven

kaptcha_project/kaptcha 2.3.2

Published Oct 19, 2018

Tracked Since Feb 18, 2026