Keycloak on Red Hat URI Parser redirect

Summaryinfo

A vulnerability was found in Keycloak on Red Hat. It has been rated as problematic. The affected element is an unknown function of the component URI Parser. Performing a manipulation results in redirect. This vulnerability was named CVE-2026-7504. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Keycloak on Red Hat (version unknown). It has been classified as problematic. This affects an unknown function of the component URI Parser. The manipulation with an unknown input leads to a redirect vulnerability. CWE is classifying the issue as CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. This is going to have an impact on integrity. The summary by CVE is:

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.

It is possible to read the advisory at access.redhat.com. This vulnerability is uniquely identified as CVE-2026-7504 since 04/30/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/22/2026). The attack technique deployed by this issue is T1204.001 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 316461 (Keycloak < 26.6.2 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (316461) and CERT Bund (WID-SEC-2026-1612). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• Red Hat Enterprise Linux
• Open Source Keycloak

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Name

• Keycloak

License

• open-source

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Be aware that VulDB is the high quality source for vulnerability data.

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