CVE-2025-1391: Medium Vulnerability in Keycloak Organization Feature

A flaw was found in the Keycloak organization feature, which allows the incorrect assignment of an organization to a user if their username or email matches the organization’s domain pattern. This issue occurs at the mapper level, leading to misrepresentation in tokens. If an application relies on these claims for authorization, it may incorrectly assume a user belongs to an organization they are not a member of, potentially granting unauthorized access or privileges.

The vulnerability has a CVSS score of 5.4, classifying it as medium severity. Organizations using Keycloak should take this vulnerability seriously, as it can lead to significant security risks, including unauthorized access to sensitive resources. Although the vulnerability is currently in a deferred status, the potential for exploitation exists, and organizations should prioritize addressing it in their patch cycle.

Organizations should implement immediate measures to validate user roles and permissions based on accurate claims. By doing so, they can mitigate the risk of unauthorized access stemming from this vulnerability.

Risk to organizations includes the possibility of unauthorized privilege escalation, which could severely compromise the integrity of organizational security. Therefore, organizations should assess their current configurations and user assignment practices to ensure they are not affected.

Organizations should address this vulnerability in their priority patch cycle to avoid potential risks associated with unauthorized access.

Vulnerability Details

The vulnerability, identified as CVE-2025-1391, arises from a flaw in the Keycloak organization feature. It allows incorrect assignment of an organization to a user based on their username or email matching the organization's domain pattern. This misassignment occurs at the mapper level, which can lead to misrepresentation in tokens. The official CVSS score for this vulnerability is 5.4, indicating a medium severity level.

The flaw was published on February 17, 2025. It is classified under CWE-284, which pertains to improper authorization issues. Organizations relying on Keycloak for user management should be particularly vigilant, as this vulnerability could expose them to unauthorized access if exploited.

Technical Analysis

The root cause of this vulnerability stems from the Keycloak organization feature's handling of organization assignments at the mapper level. When a user's email or username matches the organization's domain pattern, the application may incorrectly assign the user to that organization. This flaw can lead to the issuance of tokens that misrepresent a user's association with an organization.

The attack vector for this vulnerability is network-based, with a low attack complexity involved. Privileges required for successful exploitation are considered low, as attackers do not need elevated access to exploit this vulnerability. User interaction is not required for exploitation, which increases the risk of this vulnerability being leveraged in the wild.

The confidentiality and integrity impacts are assessed as low, while availability impact is deemed nonexistent. This indicates that while the exploitation does not disrupt service availability, it can still compromise data integrity and confidentiality by falsely representing user associations.

Risk & Impact Analysis

Real-world deployment risks associated with this vulnerability are significant. Organizations using Keycloak for user authentication and authorization must understand that incorrect organization assignments can lead to unauthorized access to sensitive systems and data. This vulnerability could impact multiple users if exploited, potentially leading to widespread unauthorized access.

The urgency for organizations to address this vulnerability is medium, given its CVSS score of 5.4. Organizations should prioritize patching this vulnerability in their patch cycle to ensure that their user authentication practices remain secure.

Exploitation Status

Affected Versions

All versions prior to vendor patch are affected by this vulnerability. Organizations using Keycloak should ensure they are running the latest version to mitigate potential risks.

Mitigation & Remediation

Organizations should prioritize patching this vulnerability immediately. They should monitor official channels for updates and apply patches as soon as they are released. In the absence of a patch, organizations can implement workarounds by reviewing and verifying organization assignments to ensure they align with user roles. Regular audits of user access and privileges will further help mitigate risks associated with this vulnerability.

For detailed guidance on securing your applications, organizations can refer to application security assessment services.

Detection Guidance

Organizations should monitor logs for any anomalies related to user assignments and token claims. Behavioral anomalies that indicate unauthorized access should be flagged for immediate investigation. Additionally, network signatures associated with unauthorized access attempts should be documented and monitored to enhance detection capabilities.

AppSecure Threat Intelligence Insight

The long-term significance of CVE-2025-1391 lies in its potential to highlight weaknesses in user assignment mechanisms within identity management systems. The pattern of misrepresentation in authorization claims raises concerns for security teams, demonstrating the need for robust validation mechanisms in user management.

As organizations increasingly rely on identity management solutions like Keycloak, understanding vulnerabilities such as this one is critical. For further insights, organizations may refer to vulnerability management program design best practices.

Additionally, organizations should consider implementing continuous security assessments, as detailed in the continuous penetration testing services to stay ahead of potential vulnerabilities.