CVE-2026-82464
pac4j-core before 6.5.6 Open Redirect via Backslash Logout
- State
- Published
- Severity
- 5.3 Medium
- Published
- Aug 29, 2026
- Updated
- Sep 1, 2026
- Reserved
- Aug 29, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
Affected Products
| Product | Versions |
|---|---|
pac4jpac4j |
|
References
- Patch Commitpatch
- pac4j Security Advisory for pac4j-core, pac4j-oidc and pac4j-samlvendor-advisory
- https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-core/src/main/java/org/pac4j/core/engine/DefaultLogoutLogic.javatechnical-description
- https://github.com/pac4j/pac4jproduct
- VulnCheck Advisory: pac4j-core before 6.5.6 Open Redirect via Backslash Logoutthird-party-advisory
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