---
id: CVE-2026-82464
title: >-
  pac4j-core before 6.5.6 contains an open redirect vulnerability in
  DefaultLogoutLogic.perform() that accepts backslash-prefixed logout redirect
  targets matching logoutUrlPattern
summary: >-
  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 e…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-601
published: '2026-08-29'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T19:54:25.810'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82464'
references:
  - url: 'https://github.com/pac4j/pac4j'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-core/src/main/java/org/pac4j/core/engine/DefaultLogoutLogic.java
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237e
    label: disclosure@vulncheck.com
  - url: 'https://www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.html'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/pac4j-core-before-6.5.6-open-redirect-via-backslash-logout
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00348
epssPercentile: 0.25638
ingestedAt: '2026-08-30T12:52:23.644Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.