A flaw was found in Keycloak. An authenticated client could exploit an Insecure Direct Object Reference (IDOR) vulnerability in the Authorization Services Protection API endpoint. By knowing or obtaining a resource's unique identifier (UUID) belonging to another Resource Server within the same realm, the client could bypass authorization checks. This allows the client to perform unauthorized GET, PUT, and DELETE operations on resources, leading to information disclosure and potential unauthorized modification or deletion of data.

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

  - A flaw was found in Keycloak. An authenticated client could exploit an Insecure Direct Object Reference
    (IDOR) vulnerability in the Authorization Services Protection API endpoint. By knowing or obtaining a
    resource's unique identifier (UUID) belonging to another Resource Server within the same realm, the client
    could bypass authorization checks. This allows the client to perform unauthorized GET, PUT, and DELETE
    operations on resources, leading to information disclosure and potential unauthorized modification or
    deletion of data. (CVE-2026-4630)

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	Severity
444165	SCA: security update for org.keycloak:keycloak-services (GHSA-c739-f6xw-6pv2)	Tenable Cloud Security	SCA Checks	medium
444165	SCA: security update for org.keycloak:keycloak-services (GHSA-c739-f6xw-6pv2)	Tenable Self-Hosted Container Security	SCA Checks	medium
316461	Keycloak < 26.6.2 Multiple Vulnerabilities	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-4630

medium

Tenable Plugins

medium

medium

medium