Red Hat Keycloak security check

Summaryinfo

A vulnerability was found in Red Hat Keycloak. It has been rated as critical. This affects an unknown function. The manipulation leads to security check. This vulnerability is listed as CVE-2026-1486. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Red Hat Keycloak (version unknown). It has been rated as critical. This issue affects an unknown function. The manipulation with an unknown input leads to a security check vulnerability. Using CWE to declare the problem leads to CWE-358. The product does not implement or incorrectly implements one or more security-relevant checks as specified by the design of a standardized algorithm, protocol, or technique. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in Keycloak. A vulnerability exists in the jwt-authorization-grant flow where the server fails to verify if an Identity Provider (IdP) is enabled before issuing tokens. The issuer lookup mechanism (lookupIdentityProviderFromIssuer) retrieves the IdP configuration but does not filter for isEnabled=false. If an administrator disables an IdP (e.g., due to a compromise or offboarding), an entity possessing that IdP's signing key can still generate valid JWT assertions that Keycloak accepts, resulting in the issuance of valid access tokens.

It is possible to read the advisory at access.redhat.com. The identification of this vulnerability is CVE-2026-1486 since 01/27/2026. The exploitation is known to be easy. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 02/11/2026). The attack technique deployed by this issue is T1211 according to MITRE ATT&CK.

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 CERT Bund (WID-SEC-2026-0356). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• Open Source Keycloak

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Vendor

• Red Hat

Name

• Keycloak

License

• open-source

Website

• Vendor: https://www.redhat.com/

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

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