CVE-2026-63175 in PlaywrightCapture
Summary
by MITRE • 07/16/2026
PlaywrightCapture stored capture-specific configuration and runtime data as mutable class-level variables rather than instance-level variables. Consequently, multiple Capture objects running within the same Python process could share state, including HTTP headers, cookies, browser storage, HTTP credentials, proxy configuration, user-agent settings, geolocation information, and captured request data.
In a multi-user or concurrent deployment, information supplied during one capture could therefore persist and be reused by a subsequent or parallel capture. This could result in the disclosure of authentication cookies, credentials, browser storage, or captured request data belonging to another user. It could also cause requests to be performed with another capture's authentication context, headers, or proxy configuration, potentially enabling unauthorized access to remote resources or interference with other capture operations.
The vulnerability is resolved by initializing all capture-specific settings and request data as instance variables in the Capture constructor, ensuring that state is isolated between capture operations.
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Analysis
by VulDB Data Team • 07/16/2026
This vulnerability represents a critical concurrency issue in the PlaywrightCapture implementation where mutable class-level variables create shared state across multiple Capture instances within the same Python process. The flaw stems from improper object-oriented design patterns that violate fundamental principles of encapsulation and isolation. When multiple Capture objects operate simultaneously, they inadvertently share configuration data including HTTP headers, cookies, browser storage contents, authentication credentials, proxy settings, user-agent strings, geolocation parameters, and captured request information. This shared state behavior creates a pathway for information leakage between concurrent operations and fundamentally undermines the security boundaries between separate capture sessions.
The technical implementation flaw aligns with CWE-807, which addresses "Reliance on Untrusted Inputs in a Security Decision" and specifically targets insecure direct object references through improper state management. The vulnerability manifests as a race condition where one capture operation can overwrite or corrupt data that another capture is actively using, creating an attack surface that enables unauthorized access patterns and data exposure scenarios. Each Capture instance should maintain its own independent configuration state to prevent cross-contamination of sensitive information.
From an operational security perspective, this vulnerability poses significant risks in multi-user environments where concurrent capture operations are common. Authentication cookies and session tokens from one user's capture can be inadvertently used by another user's operation, potentially enabling account takeover or privilege escalation attacks. The shared proxy configuration and HTTP headers could allow malicious actors to route requests through unauthorized channels or inject malicious data into the capture process. Browser storage information including local storage, session storage, and cache contents may leak between operations, exposing sensitive application state or personal information.
The remediation approach addresses this issue by implementing proper instance variable initialization within the Capture constructor, ensuring that all configuration settings and runtime data are scoped to individual object instances rather than shared across the class. This solution follows the principle of least privilege and maintains proper separation of concerns as outlined in the MITRE ATT&CK framework's defense evasion techniques, specifically targeting the prevention of information exposure through improper state management. The fix ensures that each Capture object operates independently with its own isolated configuration space, preventing unauthorized data sharing while maintaining the expected functionality of the capture operations. This approach aligns with secure coding practices recommended by OWASP and NIST guidelines for preventing concurrency-related security vulnerabilities in multi-threaded applications.