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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
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.
Metrics
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[{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.2","defaultStatus":"affected","cpes":["cpe:/a:redhat:build_keycloak:26.2::el9"]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.4","defaultStatus":"affected","cpes":["cpe:/a:redhat:build_keycloak:26.4::el9"]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.2.16","defaultStatus":"affected","cpes":["cpe:/a:redhat:build_keycloak:26.2::el9"]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.4.12","defaultStatus":"affected","cpes":["cpe:/a:redhat:build_keycloak:26.4::el9"]}]
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Initial Analysis by NIST6/03/2026 3:52:36 PM
Action
Type
Old Value
New Value
Added
CPE Configuration
OR
*cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:* versions from (including) 26.4 up to (excluding) 26.4.12
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:19594 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:19595 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:19596 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:19597 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-7504 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2464128 Types: Vendor Advisory
CVE Modified by Red Hat, Inc.5/20/2026 1:16:28 PM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:19595
Added
Reference
https://access.redhat.com/errata/RHSA-2026:19596
CVE Modified by Red Hat, Inc.5/20/2026 8:16:21 AM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:19594
Added
Reference
https://access.redhat.com/errata/RHSA-2026:19597
New CVE Received from Red Hat, Inc.5/19/2026 8:16:19 AM
Action
Type
Old Value
New Value
Added
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.
) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
