Vulnerability · Published Aug 29, 2026 · Assigned by VulnCheck

CVE-2026-82464pac4j-core before 6.5.6 Open Redirect via Backslash Logout

Medium 6.1

In plain English

A medium-severity open redirect in pac4j from pac4j. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.3%top 71.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
pac4j	pac4j	0 – before 6.5.6

Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

Patch Commit patch
pac4j Security Advisory for pac4j-core, pac4j-oidc and pac4j-saml vendor-advisory
https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-core/src/main/java/org/pac4j/core/engine/DefaultLogoutLogic.java technical-description
https://github.com/pac4j/pac4j product
VulnCheck Advisory: pac4j-core before 6.5.6 Open Redirect via Backslash Logout third-party-advisory