CVE-2026-62114 in Passster Plugin
Summary
by MITRE • 09/11/2026
Unauthenticated Broken Access Control in Passster <= 4.3.13 versions.
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Analysis
by VulDB Data Team • 09/11/2026
The vulnerability identified as an unbroken access control issue within Passster versions prior to or equal to 4.3.13 represents a critical failure in the application's authentication and authorization mechanisms. This flaw allows attackers who have not yet authenticated with the system to bypass security controls that are intended to restrict access to sensitive data or administrative functions. In modern web applications, particularly those dealing with password management like Passster, maintaining strict separation between unauthenticated and authenticated sessions is paramount. The existence of this vulnerability indicates a fundamental misconfiguration or coding error where specific endpoints or API calls do not properly validate the session state or user permissions before processing requests. This type of flaw falls squarely under CWE-284 Improper Access Control, which describes situations where an actor is able to access resources or perform actions that they should not be allowed to do based on their assigned privileges.
From a technical perspective, broken access control vulnerabilities often arise when developers assume that client-side checks are sufficient for security or fail to implement server-side validation of user roles and permissions. In the context of Passster, this likely means that certain API endpoints responsible for retrieving master passwords, accessing stored credentials, or modifying account settings do not require a valid authentication token or session cookie as part of their request parameters. An attacker can exploit this by crafting direct HTTP requests to these unprotected endpoints using tools such as curl or specialized web proxies like Burp Suite. By manipulating the URL paths and payload structures, an unauthorized user can interact with functionality that is supposed to be gated behind a login wall. This bypasses the intended security architecture entirely, effectively rendering any other authentication measures in place irrelevant for those specific vectors of attack.
The operational impact of this vulnerability is severe due to the sensitive nature of password manager applications. Passster serves as a centralized repository for users' most critical digital identities, including banking credentials, email accounts, and proprietary business secrets. If an attacker can access these endpoints without authentication, they gain immediate read or write access to potentially thousands of high-value targets depending on the scope of deployment. This leads directly to CWE-200 Information Exposure, where sensitive information is disclosed to unauthorized actors. The consequences extend beyond simple data theft; if the vulnerability allows for modification rather than just reading, it could lead to account takeover scenarios where an attacker changes passwords or adds new entries that persist even after the victim attempts to secure their account. This undermines the core value proposition of using a password manager and exposes users to significant financial loss, reputational damage, and potential identity theft.
In terms of threat modeling and adversary behavior, this vulnerability aligns with techniques observed in the MITRE ATT&CK framework, specifically under T1078 Valid Accounts or more broadly within initial access vectors that rely on misconfigured permissions rather than complex exploitation chains. Attackers often prioritize such low-effort, high-impact vulnerabilities because they require minimal resources to exploit and yield immediate results. Unlike zero-day exploits in compiled binaries, broken access controls are logic errors that can be discovered through simple enumeration or fuzzing of API endpoints. The persistence of this flaw suggests a lack of rigorous security testing during the development lifecycle, particularly regarding automated scanning for authentication bypasses and manual penetration testing focused on authorization checks.
Mitigation strategies must focus on immediate remediation followed by long-term architectural improvements. For organizations currently running Passster versions 4.3.13 or earlier, the primary action is to upgrade immediately to a patched version where these access control rules have been corrected. If upgrading is not immediately feasible due to operational constraints, temporary mitigations should include implementing network-level controls such as Web Application Firewalls that can detect and block requests lacking valid session tokens for sensitive endpoints. Additionally, developers must conduct a thorough audit of all API routes to ensure that every endpoint enforces authentication checks at the framework level rather than relying on individual function calls. Implementing robust logging and monitoring is also essential to detect any attempts to exploit this vulnerability in real-time, allowing security teams to respond before data exfiltration occurs.
Long-term resilience against such vulnerabilities requires adopting a secure development lifecycle that integrates static application security testing tools capable of identifying authorization flaws early in the coding phase. Regular penetration tests should specifically target access control mechanisms, simulating attacks from unauthenticated perspectives to verify that all protected resources remain inaccessible without proper credentials. Furthermore, adhering to industry standards like OWASP Top 10 guidelines regarding broken access control can provide a structured approach to preventing recurrence. By ensuring that every request is explicitly authorized based on the user's role and identity, organizations can significantly reduce their attack surface and protect sensitive data from unauthorized disclosure or manipulation.