BIT-keycloak-2026-7504

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Import Source
https://github.com/bitnami/vulndb/tree/main/data/keycloak/BIT-keycloak-2026-7504.json
JSON Data
https://api.osv.dev/v1/vulns/BIT-keycloak-2026-7504
Aliases
Published
2026-08-25T11:42:35Z
Modified
2026-09-08T08:48:07Z
Summary
Org.keycloak/keycloak-services: open redirect when using wildcard valid redirect uris in keycloak
Details

A flaw was found in Keycloak's URL validation logic during redirect operations. By crafting a malicious request, an attacker could bypass validation to redirect users to unauthorized URLs, potentially leading to the exposure of sensitive information within the domain or facilitating further attacks. This vulnerability specifically affects Keycloak clients configured with a wildcard (*) in the "Valid Redirect URIs" field and requires user interaction to be successfully exploited.

The issue stems from a discrepancy in how Keycloak and the underlying Java URI implementation handle the user-info component of a URL. If a malicious redirect URL is constructed using multiple @ characters in the user-info section, Java's URI parser fails to extract the user-info, leaving only the raw authority field. Consequently, Keycloak's validation check fails to detect the malformed user-info, falls back to a wildcard comparison, and incorrectly permits the malicious redirect.

Database specific 
{
    "cpes": [
        "cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*",
        "cpe:2.3:a:keycloak:keycloak:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
}
References

Affected packages

Bitnami / keycloak

Package

Name
keycloak
Purl
pkg:bitnami/keycloak

Severity

  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N CVSS Calculator

Affected ranges

Type
SEMVER
Events
Introduced
26.4.0
Fixed
26.4.12

Database specific

source 
"https://github.com/bitnami/vulndb/tree/main/data/keycloak/BIT-keycloak-2026-7504.json"