CVE-2018-18531

Name: CVE-2018-18531
Creator: NVD / NIST
Published: 2018-10-19T20:29:00.57+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.47%

Last modified Jun 17, 2026

CVE-2018-18531 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.47% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

1.47%

70.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-330

Affected Software

Vendor	Product	Versions
Kaptcha Project	Kaptcha	2.3.2

References

https://github.com/penggle/kaptcha/issues/3Third Party Advisory
https://github.com/penggle/kaptcha/issues/3Third Party Advisory

Timeline

Published: Oct 19, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-18531?

How severe is CVE-2018-18531?

Severity scoring for CVE-2018-18531 is pending analysis. The EPSS model estimates a 1.47% probability of exploitation in the next 30 days.

How do I fix CVE-2018-18531?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-18531?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST