Auth bypass in Pac4j
CVE-2026-82463
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.006 (44.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237e (patch)
- www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.html (vendor-advisory)
- github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-core/src/main/java/org/pac… (technical-description)
- github.com/pac4j/pac4j (product)
- www.vulncheck.com/advisories/pac4j-core-before-6.5.6-authorization-bypass-via-r… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82463?
- CVE-2026-82463 is a high-severity vulnerability in Pac4j, classified under Incorrect Authorization. CVSS score: 8.1/10. Published 2026-08-29.
- How severe is CVE-2026-82463?
- High severity. CVSS v3 base score is 8.1 out of 10.