CVE-2026-39439 in WebSamurai Plugin
Summary
by MITRE • 10/02/2026
Missing Authorization vulnerability in Kiera Howe WebSamurai websamurai allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects WebSamurai: from n/a through 1.0.7.
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Analysis
by VulDB Data Team • 10/02/2026
The identified vulnerability represents a critical failure in access control mechanisms within the WebSamurai application, specifically affecting versions ranging from initial releases up to version 1.0.7. This flaw is categorized as an Incorrectly Configured Access Control Security Level issue, which fundamentally undermines the integrity of authentication and authorization protocols designed to restrict user actions based on their assigned privileges. In a properly secured system, access control checks must be enforced consistently at every point where sensitive operations are initiated or data is accessed. However, in this instance, the application fails to verify whether an authenticated user possesses the necessary permissions before executing specific functions, thereby allowing unauthorized entities to bypass intended security boundaries.
From a technical perspective, this vulnerability stems from missing authorization logic within the server-side processing of requests. When a client submits a request to perform an action that requires elevated privileges or access to restricted resources, the application does not adequately validate the user's role or permission set against the requested operation. This oversight allows attackers who have valid credentials for lower-privileged accounts to manipulate parameters such as HTTP method types, URL paths, or POST data payloads to trigger administrative functions or view sensitive information that should be inaccessible. The root cause lies in the absence of robust server-side checks that enforce role-based access control policies consistently across all application endpoints and API calls.
The operational impact of this vulnerability is severe, particularly for organizations relying on WebSamurai for web security assessments where handling sensitive data is routine. An attacker with a basic user account can escalate their privileges to perform administrative tasks, modify system configurations, or exfiltrate confidential information belonging to other users or the organization itself. This breach of confidentiality and integrity compromises the trustworthiness of the application's output and potentially exposes critical infrastructure details during security audits. Furthermore, because WebSamurai is often used by security professionals to identify vulnerabilities in target systems, a compromised instance could lead to inaccurate assessment results or even be weaponized against other targets if the attacker gains control over the scanning engine itself.
This vulnerability aligns with CWE-269, which describes Improper Privilege Control, and falls under the MITRE ATT&CK technique T1078, Valid Accounts, specifically within the context of privilege escalation or unauthorized access using legitimate credentials but without proper authorization checks. To mitigate this risk, it is imperative to upgrade WebSamurai to a version later than 1.0.7 where these access control flaws have been addressed by the developers. Additionally, organizations should implement defense-in-depth strategies such as network segmentation to isolate vulnerable instances and enforce strict input validation on all client-side requests. Regular security audits focusing on authorization logic are recommended to ensure that future updates or custom configurations do not reintroduce similar gaps in access control enforcement.