SEPTEMBER 19, 2026
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Case File

CVE-2018-18531

CRITICAL · CVSS 9.8 EPSS 1.47% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2018-10-19 · Last synced 2026-08-04

CyberRota Analysis

This is a critical severity vulnerability with a CVSS score of 9.8. It affects Java. Public exploit code or proof-of-concept references have been detected in its references. It may be remotely exploitable.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2018-18531
Severity
CRITICAL
CVSS
9.8
EPSS
1.47%
Java

Original NVD 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.