A flaw was found in Keycloak. A broken access control vulnerability in the Account Resources user lookup endpoint allows a remote authenticated user, who owns at least one User-Managed Access (UMA) resource, to enumerate and harvest personally identifiable information (PII) for all realm users. By sending crafted requests with arbitrary usernames or email values, the endpoint returns full profile objects for unrelated users. This leads to broad profile-level information disclosure.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - A flaw was found in Keycloak. A broken access control vulnerability in the Account Resources user lookup
    endpoint allows a remote authenticated user, who owns at least one User-Managed Access (UMA) resource, to
    enumerate and harvest personally identifiable information (PII) for all realm users. By sending crafted
    requests with arbitrary usernames or email values, the endpoint returns full profile objects for unrelated
    users. This leads to broad profile-level information disclosure. (CVE-2026-37981)

Keycloak versions installed prior to 26.6.2 are affected by multiple vulnerabilities, including:

  - A flaw was found in Keycloak's redirect URI validation logic. An attacker can bypass     validation to redirect users to malicious sites, potentially leading to phishing attacks and     credential theft. (CVE-2026-7504)

  - A session fixation vulnerability exists in the OIDC login flow. An unauthenticated attacker     can pre-create sessions leading to account takeover if a user logs in using the attacker's     session. (CVE-2026-7507)

  - A flaw was found in Keycloak's SAML endpoint processing. A crafted XML request to the SAML     endpoint can cause a denial of service by consuming excessive server resources. (CVE-2026-7307)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
459345	Echo: keycloak-25: security update to 25.0.6+e1org.keycloak:keycloak-services: security update to 26.4.12	Tenable Cloud Security	Echo Local Security Checks	Local	medium
459345	Echo: keycloak-25: security update to 25.0.6+e1org.keycloak:keycloak-services: security update to 26.4.12	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
444157	SCA: security update for org.keycloak:keycloak-services (GHSA-933f-rg6j-f46p)	Tenable Cloud Security	SCA Checks	Local	medium
444157	SCA: security update for org.keycloak:keycloak-services (GHSA-933f-rg6j-f46p)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium
316461	Keycloak < 26.6.2 Multiple Vulnerabilities	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-37981

medium

Tenable Plugins

medium

medium

medium

medium

medium