CVE-2026-82464

MEDIUM 6.1

pac4j-core before 6.5.6 Open Redirect via Backslash Logout

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-601
Vendor	pac4j
Product	pac4j
Published	Aug 29, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

pac4j / pac4j

0 < 6.5.6

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237e pac4j.org: https://www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.html github.com: https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-core/src/main/java/org/pac4j/core/engine/DefaultLogoutLogic.java github.com: https://github.com/pac4j/pac4j vulncheck.com: https://www.vulncheck.com/advisories/pac4j-core-before-6.5.6-open-redirect-via-backslash-logout

Credits

Joshua Rogers (AISLE Research)