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8.6
CVE-2026-82463: pac4j-core before 6.5.6 lets users skip login checks
CVE-2026-82463 · published 5 days ago
Summary
The pac4j-core library versions earlier than 6.5.6 contain a mistake that flips the logic used to verify a user's role. Because of this, an attacker can log in with a low‑privilege account and still reach areas that should require higher privileges. Update to version 6.5.6 or later to correct the check and protect restricted resources.
What to do
- Update pac4j pac4j to version 6.5.6 or later.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| pac4j | pac4j | < 6.5.6 |
Original advisory text
pac4j-core before 6.5.6 contains an authentication bypass vulnerability in CheckProfileTypeAuthorizer that reverses the profile type validation logic. Attackers can authenticate through a weaker cl...
pac4j-core before 6.5.6 contains an authentication bypass vulnerability in CheckProfileTypeAuthorizer that reverses the profile type validation logic. Attackers can authenticate through a weaker client and access resources requiring a stronger profile type by satisfying generic profile checks.
References
- https://github.com/pac4j/pac4j
- https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-core/src/main/java/...
- https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237e
- https://www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.html
- https://www.vulncheck.com/advisories/pac4j-core-before-6.5.6-authorization-bypas...
Severity
8.6
High
CVSS 3.1: 8.1 (NVD)
CVSS 4.0: 8.6 (NVD)
Exploitation
EPSS <1%
Type
CWE-863Incorrect Authorization
Timeline
Published29 Aug 2026
Updated2 Sep 2026
First seen29 Aug 2026
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