Comprehensive Proof of Concept Utilizing Only a Public Key

Critical Security Alert: Vulnerability in pac4j-jwt Library

A severe security flaw has been discovered in the widely-used pac4j-jwt Java authentication library, identified as CVE-2026-29000 with a CVSS score of 10.0. This vulnerability can lead to a complete authentication bypass, allowing attackers to impersonate any user—including admins—using only the server’s RSA public key.

Key Insights:

• Nature of the Flaw: An anomaly in signature verification can cause it to be silently skipped, enabling exploitation.
• Patch Availability: Quick action was taken—maintainer Jérôme Leleu confirmed and published patches:
  • Upgrade to:
    • 4.x: 4.5.9 or newer
    • 5.x: 5.7.9 or newer
    • 6.x: 6.3.3 or newer
• Research Foundation: CodeAnt AI examined patch effectiveness post-CVE disclosure and found critical vulnerabilities.

Is your system at risk? Ensure you check and update your version immediately.

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