CVE-2026-93504 in SveltyCMS
Summary
by MITRE • 09/18/2026
A vulnerability has been found in SveltyCMS 0.0.6. This affects an unknown part of the file src/routes/api/[...path]/+server.ts of the component User Attribute Update Endpoint. Such manipulation leads to improper access controls. It is possible to launch the attack remotely. The name of the patch is 05b4f9efeb79e9d72a693232334d7529687f896f. It is advisable to implement a patch to correct this issue.
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Analysis
by VulDB Data Team • 09/18/2026
The vulnerability identified in SveltyCMS version 0.0.6 represents a critical failure in access control mechanisms within the application's backend architecture. Specifically, the flaw resides in the User Attribute Update Endpoint, located at src/routes/api/[...path]/+server.ts. This endpoint is designed to handle requests that modify user profile information or other attribute-based data associated with authenticated users. The core issue stems from improper authorization checks during the processing of these update requests. In a secure implementation, any request attempting to alter sensitive user attributes must verify not only that the requester is authenticated but also that they possess the specific privileges required for such modifications. However, in this vulnerable version, the server fails to adequately validate whether the requesting entity has the authority to modify the targeted attribute or if it is attempting to escalate its own permissions by modifying fields belonging to other users or system-level configurations. This lack of strict enforcement allows an attacker who possesses valid credentials for a lower-privileged account to manipulate data that should be restricted, thereby bypassing intended security boundaries.
From a technical perspective, this vulnerability aligns with CWE-269, which classifies Improper Privilege Management, and more specifically CWE-862, Missing Authorization. The absence of robust server-side validation means that the application relies on client-side controls or incomplete logic to enforce access policies. When an attacker sends a crafted HTTP request to the affected API endpoint with modified payload data targeting restricted fields, the server processes these changes without verifying if the action is permitted for the current user session. This type of flaw often arises from developers assuming that because a user can view certain information, they should also be able to edit it, or failing to implement role-based access control (RBAC) checks at every relevant API entry point. The use of a catch-all route pattern [...path] in the server file suggests a dynamic routing mechanism that may have inadvertently exposed internal endpoints or failed to apply specific middleware guards intended for sensitive operations.
The operational impact of this vulnerability is significant, as it enables remote attackers to compromise the integrity and confidentiality of user data without requiring physical access or local execution privileges on the target system. An attacker can exploit this flaw remotely over a network connection, typically via standard web protocols such as HTTP or HTTPS. By leveraging tools like curl or specialized exploitation frameworks, an adversary can send maliciously crafted requests to manipulate user attributes. This could lead to privilege escalation, where a regular user gains administrative capabilities by modifying their own role attribute in the database. Furthermore, it allows for data tampering, enabling attackers to alter email addresses, passwords, or other personally identifiable information (PII) associated with victim accounts. In enterprise environments using SveltyCMS, this could result in unauthorized access to sensitive business logic, disruption of service through account lockouts caused by mass attribute manipulation, and potential compliance violations related to data protection regulations such as GDPR or HIPAA due to the exposure and alteration of personal data.
To mitigate this vulnerability, immediate action is required to apply the provided patch identified by commit hash 05b4f9efeb79e9d72a693232334d7529687f896f. This update likely introduces stricter authorization checks within the User Attribute Update Endpoint, ensuring that only users with appropriate roles can modify specific attributes and preventing cross-user data manipulation. In addition to applying the patch, organizations should implement defense-in-depth strategies. It is advisable to enforce strict input validation on all API endpoints to reject unexpected or malformed payloads. Implementing comprehensive logging and monitoring for anomalous access patterns to user attribute APIs can help detect exploitation attempts in real-time. Furthermore, adopting a principle of least privilege across the application's architecture ensures that even if such vulnerabilities exist, their impact is contained by limiting what each role can actually do within the system. Regular security audits and penetration testing focused on broken object level authorization (BOLA) flaws are recommended to identify similar weaknesses before they can be exploited in production environments.