CVE-2026-117859 Keycloak-services: keycloak-services: par single-use bypass via flow restart
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-117859?
CVE-2026-117859 is a medium-severity vulnerability in Red Hat Build of Keycloak, published on 29 Oct 2026.
Official description
A flaw was found in the Pushed Authorization Request PAR implementation of the keycloak-services component. The issue occurs when an authentication flow is restarted, which incorrectly clears the internal markers used to track PAR consumption while leaving the request active. This allows an attacker to reuse the same authorization request to obtain multiple access tokens, bypassing security requirements for single-use requests.
Weakness: CWE-670
Which versions are affected by CVE-2026-117859?
How do I fix CVE-2026-117859?
No fix has been published for CVE-2026-117859 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-117859 being exploited?
There is no known exploitation of CVE-2026-117859 in the wild and no public exploit code.
Sources
Also known as GHSA-3cf5-cf36-hfwx.