Authentication Bypass Vulnerability in pac4j-core by pac4j
CVE-2026-82463

8.6HIGH

Key Information:

Vendor

Pac4j

Status
Pac4j
Vendor
CVE Published:
29 August 2026

What is CVE-2026-82463?

The pac4j-core library prior to version 6.5.6 has an authentication bypass vulnerability stemming from a flaw in the CheckProfileTypeAuthorizer. This flaw allows attackers to authenticate as a weaker client and subsequently gain access to resources which ideally require a stronger profile type. The vulnerability compromises the intended profile validation mechanism, enabling unauthorized access to sensitive resources by only meeting general profile checks.

Affected Version(s)

pac4j 0 < 6.5.6

References

https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc4383...
patch
https://www.pac4j.org/blog/security-advisory-pac4j-core-o...
vendor-advisory
https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pa...
technical-description

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Joshua Rogers (AISLE Research)
.