Description
A flaw was found in Keycloak. This issue allows an attacker, who controls another path on the same web server, to bypass the allowed path in redirect Uniform Resource Identifiers (URIs) that use a wildcard. A successful attack may lead to the theft of an access token, resulting in information disclosure.
Affected products
redhat: build of keycloak
References10
- access.redhat.com/errata/RHSA-2026:6475 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:6476 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:6477 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:6478 Vendor Advisory
- access.redhat.com/security/cve/CVE-2026-3872 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2445988 Issue TrackingVendor Advisory
- access.redhat.com/errata/RHSA-2026:6475 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:6476 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:6477 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:6478 Vendor Advisory
Metrics
- CVSS 3.1
-
7.3
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N - EPSS — exploit probability
- 0% percentile: 39 · as of 12 November 2026
- CWE
- CWE-601
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.