What’s Vulnerable › Vulnerabilities

CVE-2023-4612: MFA bypass in Apereo CAS

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-09 · updated 2026-06-17
• Weakness: CWE-302

Description

Improper Authentication vulnerability in Apereo CAS in jakarta.servlet.http.HttpServletRequest.getRemoteAddr method allows Multi-Factor Authentication bypass.This issue affects CAS: through 7.0.0-RC7. It is unknown whether in new versions the issue will be fixed. For the date of publication there is no patch, and the vendor does not treat it as a vulnerability.

Affected products

• Apereo Central Authentication Service: before 7.0.0; 7.0.0-rc1, 7.0.0-rc2, 7.0.0-rc3, 7.0.0-rc4, 7.0.0-rc5, 7.0.0-rc6 (+1) — fixed in 7.0.0

How to fix

Upgrade to a fixed version: Apereo Central Authentication Service 7.0.0. Check the vendor advisory for mitigations.

References

• https://cert.pl/en/posts/2023/11/CVE-2023-4612/
• https://cert.pl/posts/2023/11/CVE-2023-4612/
• https://cert.pl/en/posts/2023/11/CVE-2023-4612/
• https://cert.pl/posts/2023/11/CVE-2023-4612/

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