CVE-2026-82464 pac4j-core before 6.5.6 Open Redirect via Backslash Logout
Attackers can redirect users to malicious sites after logout via crafted backslash-prefixed URLs in the pac4j security library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-82464?
CVE-2026-82464 is a medium-severity vulnerability in pac4j, published on 29 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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.
Weakness: CWE-601
Which versions are affected by CVE-2026-82464?
How do I fix CVE-2026-82464?
No fix has been published for CVE-2026-82464 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-82464 being exploited?
There is no known exploitation of CVE-2026-82464 in the wild and no public exploit code.
Sources
Also known as GHSA-f668-xfp8-vhf5.