CVE-2020-12849: 
NixOS vulnerability analysis and mitigation

Pydio Cells 2.0.4 contains multiple vulnerabilities that affect its web application functionality. The vulnerability (CVE-2020-12849) specifically allows any user, including those with standard and shared user roles, to upload a profile image to the web application. These profile pictures can later be accessed directly with the generated URL by any unauthenticated or authenticated user, creating a potential security risk (Core Labs).

The vulnerability exists in the profile picture upload functionality of Pydio Cells 2.0.4. When a user uploads a profile image, the system generates a URL that can be accessed without authentication. This implementation flaw allows unrestricted access to uploaded profile pictures, potentially exposing sensitive information or enabling further attacks (Core Labs).

The vulnerability allows any authenticated or unauthenticated user to access profile pictures uploaded to the system through generated URLs. This could potentially be exploited as part of a larger attack chain, especially when combined with other vulnerabilities in the system (Core Labs).

The vulnerability can be exploited by uploading a profile picture and accessing it through the generated URL. The attack requires minimal technical expertise as it only involves normal application functionality. The vulnerability has been documented with proof-of-concept demonstrations (Core Labs).

The vulnerability has been fixed in version 2.0.7 of Pydio Cells. Users are advised to upgrade to this version or later to address this security issue (Core Labs).