What is the CVSS score of CVE-2026-7504?

CVE-2026-7504 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.0%.

Which versions of Keycloak are affected by CVE-2026-7504?

Red Hat Keycloak authentication systems using unrestricted redirect settings are vulnerable to phishing attacks that can hijack user sessions and route users to attacker-controlled domains.. A patch is available.

How to fix or mitigate CVE-2026-7504?

Within 24 hours: Audit all Keycloak deployments to identify instances with wildcard ('*') entries in Valid Redirect URIs configuration. Within 7 days: Remove or replace wildcard entries with explicit, domain-specific redirect URIs on all affected Keycloak installations and deploy configuration changes. Within 30 days: Monitor Red Hat security advisories for patch availability and establish upgrade testing timeline; implement security awareness training on phishing and suspicious authentication redirects.

Keycloak CVE-2026-7504

EUVD-2026-30890 HIGH

URL Redirection to Untrusted Site (Open Redirect) (CWE-601)

2026-05-19 redhat

GHSA-rp95-xpg9-c2cq

Open Redirect Java Red Hat Build Of Keycloak

8.1

CVSS 3.1 · Vendor: redhat

Severity by source

Vendor (redhat) PRIMARY

8.1 HIGH

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

Red Hat

8.1 HIGH

qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

May 19, 2026 - 12:00 vuln.today

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

61 maven packages depend on org.keycloak:keycloak-services (28 direct, 33 indirect)

Ecosystem-wide dependent count for version 26.6.2.

DescriptionCVE.org

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.

AnalysisAI

Open redirect in Red Hat build of Keycloak permits remote attackers to send victims to attacker-controlled hosts by abusing a parser discrepancy between Keycloak and Java's URI implementation during redirect URL validation. The flaw applies only to clients configured with a wildcard ('*') in the 'Valid Redirect URIs' field and requires the victim to click a crafted link, with no public exploit identified at time of analysis.

Technical ContextAI

Keycloak is a widely deployed open-source identity and access management platform; the affected component is the redirect URI validator used during OAuth2/OIDC authorization flows. The root cause is CWE-601 (URL Redirection to Untrusted Site / Open Redirect), driven by a parser-differential bug: when a URL contains multiple '@' characters in the user-info portion (e.g., 'https://trusted.example.com@@attacker.tld'), Java's java.net.URI parser does not populate the userInfo field and exposes only the raw authority string, while Keycloak's validation logic falls back to a permissive wildcard comparison and accepts the malformed authority as valid. The affected CPE is cpe:2.3:a:red_hat:red_hat_build_of_keycloak, confirming the Red Hat distribution as the in-scope product.

RemediationAI

Patch availability per vendor advisory should be confirmed directly at https://access.redhat.com/security/cve/CVE-2026-7504 and https://bugzilla.redhat.com/show_bug.cgi?id=2464128, as no exact fix version was provided in the input data. The most effective compensating control is to remove the wildcard from every client's 'Valid Redirect URIs' and replace it with an explicit allowlist of exact redirect URIs or scheme+host prefixes, which eliminates the vulnerable code path entirely at the cost of requiring each new redirect target to be registered. Where wildcards cannot be removed immediately for operational reasons, constrain them to the narrowest scheme/host pattern possible, audit existing clients for '*' entries via the admin REST API, and consider front-end URI sanitization at a reverse proxy to reject authorize-endpoint requests whose redirect_uri parameter contains multiple '@' characters - noting that proxy-level filtering can break legitimate flows that legitimately use user-info syntax.

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Vendor StatusVendor

CVE-2026-7504 vulnerability details – vuln.today

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