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Vulnerability record · CVE-2026-7504 · published 19 May 2026

CVE-2026-7504: Redhat build of keycloak open redirect vulnerability

Redhat · Build Of Keycloak

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.

8.1 CVSS 3.1 High EPSS 0.50% · top 59.7% CWE-601 · Open redirect
8.1CVSS 3.1 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
13References
15 Jul 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:19594 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19595 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19596 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19597 Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-7504 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2464128 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19594 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19595 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19596 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19597 Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-7504 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2464128 Vendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7504.json

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Source: NIST National Vulnerability Database (record CVE-2026-7504), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.