Vulnerability in Kaptcha Project
CVE-2018-18531
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: 0.015 (71.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Kaptcha_project Kaptcha — versions 2.3.2
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2018-18531?
- CVE-2018-18531 is a critical-severity vulnerability in Kaptcha Project, classified under Use of Insufficiently Random Values. CVSS score: 9.8/10. Published 2018-10-19.
- How severe is CVE-2018-18531?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2018-18531 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.