CVE-2026-53497 in CrossWatch
Summary
by MITRE • 08/21/2026
CrossWatch (CW) is a synchronization engine. Prior to version 0.9.21, GET /api/app-auth/status is accessible without authentication and returns the other_sessions array, which exposes metadata of all active sessions — including originating IP addresses, User-Agent strings, internal session IDs, and creation/expiry timestamps. Any unauthenticated network attacker can enumerate this data without credentials. Version 0.9.21 fixes the issue.
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Analysis
by VulDB Data Team • 08/21/2026
The vulnerability identified in CrossWatch versions prior to 0.9.21 represents a critical failure in access control mechanisms within its synchronization engine API. Specifically, the endpoint GET /api/app-auth/status was configured without requiring any form of authentication or authorization checks before processing requests and returning responses. This misconfiguration allows any network actor with connectivity to the service to invoke this endpoint freely, bypassing the intended security boundaries that should restrict sensitive operational data to authenticated users only. The absence of an access control check at this specific API route creates a direct pathway for information disclosure, as the server processes the request and generates a response containing detailed session metadata without verifying the identity or privileges of the requester.
The technical flaw lies in the improper implementation of authentication middleware or endpoint-specific security policies within the application logic. By exposing the other_sessions array to unauthenticated access, the system leaks comprehensive details about active user sessions across all connected devices. This data includes originating IP addresses, which can reveal network topology and geographic locations; User-Agent strings, which disclose operating systems and browser versions potentially aiding in targeted exploit development; internal session IDs that could be leveraged for session hijacking if combined with other vectors; and creation or expiry timestamps that assist attackers in understanding the lifecycle of active sessions. This level of granularity provides an attacker with a detailed map of user activity and infrastructure, significantly lowering the barrier to entry for further malicious activities such as credential stuffing, targeted phishing, or direct session takeover attacks.
From an operational impact perspective, this vulnerability facilitates unauthorized enumeration of sensitive system state information. An unauthenticated network attacker can systematically query this endpoint to gather intelligence on active users without triggering typical authentication failure alerts that might otherwise draw attention from security monitoring systems. The exposure of IP addresses and User-Agent strings aids in reconnaissance efforts, allowing attackers to profile victims based on their technical environment and location. Furthermore, the disclosure of internal session IDs poses a risk if those identifiers are predictable or can be correlated with other data sources, potentially leading to unauthorized access to user accounts by replaying valid session tokens. The impact is compounded by the fact that this information is available for all active sessions simultaneously, providing a holistic view of current system usage rather than isolated incidents.
This vulnerability aligns closely with CWE-284 Improper Access Control and CWE-200 Exposure of Sensitive Information to an Unauthorized Actor. In terms of offensive security frameworks, it corresponds to ATT&CK technique T1078 Valid Accounts when considering the potential for session hijacking derived from exposed credentials or tokens, and more directly to T1592 Gather Victim Host Information through enumeration of device fingerprints via User-Agent strings and network positioning via IP addresses. The exploitation does not require complex payloads but relies on simple HTTP requests, making it highly accessible to automated scanning tools and low-skill attackers alike.
To mitigate this vulnerability, organizations running CrossWatch versions prior to 0.9.21 should immediately upgrade to version 0.9.21 or later where the authentication requirement for the /api/app-auth/status endpoint has been enforced. For systems that cannot be updated immediately due to operational constraints, implementing a reverse proxy rule to block unauthenticated access to this specific API path is recommended as an interim measure. Additionally, security teams should audit other API endpoints within the CrossWatch application to ensure consistent enforcement of authentication and authorization policies across all routes. Regular penetration testing focused on broken object level authorization (BOLA) and improper access control flaws can help identify similar misconfigurations in future development cycles or third-party integrations.