Red Hat Keycloak Keycloak Services redirect

Summaryinfo

A vulnerability, which was classified as problematic, was found in Red Hat Keycloak. Impacted is an unknown function of the component Keycloak Services. Executing a manipulation can lead to redirect. This vulnerability is registered as CVE-2026-15943. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Red Hat Keycloak (affected version not known). It has been declared as problematic. This vulnerability affects some unknown functionality of the component Keycloak Services. The manipulation with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. CVE summarizes:

A flaw was found in the Keycloak keycloak-services component, which handles the management of identity providers. The issue occurs when a delegated administrator updates an OIDC identity provider using a masked client secret sentinel value. Due to improper validation, Keycloak reuses the existing real secret even if security-sensitive fields like the token URL have been changed, allowing an attacker to redirect and capture the secret.

The advisory is shared for download at access.redhat.com. This vulnerability was named CVE-2026-15943 since 07/16/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 07/17/2026). The MITRE ATT&CK project declares the attack technique as T1204.001.

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 vulnerability database at EUVD (EUVD-2026-45164). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Red Hat

Name

• Keycloak

License

• open-source

Website

• Vendor: https://www.redhat.com/

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Once again VulDB remains the best source for vulnerability data.

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