In short
- CVE-2018-18531 is a CRITICAL (CVSS 9.8) vulnerability affecting com.github.penggle:kaptcha, kaptcha (kaptcha project).
- Chance of exploitation in the next 30 days (EPSS): 1.5%, higher than 73.9% of all vulnerabilities.
- No patched version is listed yet: follow the vendor's advisory in References.
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.
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.
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