flask@2.3.0 vulnerabilities

A simple framework for building complex web applications.

Direct Vulnerabilities

Known vulnerabilities in the flask package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability Vulnerable Version
  • H
Information Exposure

Affected versions of this package are vulnerable to Information Exposure in the form of exposing the permanent session cookie, when all of the following conditions are met:

  1. The application is hosted behind a caching proxy that does not strip cookies or ignore responses with cookies.

  2. The application sets session.permanent = True.

  3. The application does not access or modify the session at any point during a request.

  4. SESSION_REFRESH_EACH_REQUEST is enabled (the default).

  5. The application does not set a Cache-Control header to indicate that a page is private or should not be cached.

A response containing data intended for one client may be cached and sent to other clients. If the proxy also caches Set-Cookie headers, it may send one client's session cookie to other clients. Under these conditions, the Vary: Cookie header is not set when a session is refreshed (re-sent to update the expiration) without being accessed or modified.

How to fix Information Exposure?

Upgrade flask to version 2.2.5, 2.3.2 or higher.

[,2.2.5) [2.3.0,2.3.2)