Personal Management System

This error occurs due to a PHP version mismatch between the Docker container (PHP 7.4) and package requirements that need PHP 8.1 or higher, combined with outdated lock file constraints. To fix: 1) Update the Dockerfile base image to a PHP 8.1+ version (e.g., php:8.1-fpm) and rebuild the container. 2) After starting the container, run 'composer update --with-all-dependencies' to resolve conflicting package versions (like specshaper/encrypt-bundle vs doctrine/orm). If you still face issues, manually edit composer.json to allow compatible versions of doctrine/common or other conflicting packages. These steps align the environment with current dependency requirements. Note that v2.0 of the project simplifies self-hosting and avoids these legacy conflicts.

Add unpredictable CSRF tokens tied to user sessions. Include the token in all state-changing requests (forms, AJAX). Strictly validate the token server-side before processing any action. Use existing framework libraries (e.g., Spring Security, Django CSRF) or implement manually: generate high-entropy token on login, store in session, embed in forms as hidden field, and verify on submission.