Open Redirect in Pac4j
CVE-2026-82464
pac4j-core before 6.5.6 contains an open redirect vulnerability in DefaultLogoutLogic.perform() that accepts backslash-prefixed logout redirect targets matching logoutUrlPattern. Attackers can craft logout links with backslash-prefixed external hosts that browsers normalize into network-path references, redirecting victims to attacker-controlled sites after logout.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (26.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
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-open-redirect-via-backslas… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82464?
- CVE-2026-82464 is a medium-severity vulnerability in Pac4j, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2026-08-29.
- How severe is CVE-2026-82464?
- Medium severity. CVSS v3 base score is 6.1 out of 10.