What is the best security $_POST method?

You have to sanitize or escape the data based on type and application of the data. Like below-

$title = sanitize_text_field( $_POST['title'] );
update_post_meta( $post->ID, 'title', $title );

It’s a quite huge topic. You better read this Validating Sanitizing and Escaping User Data.

Related Posts:

  1. What is the difference between a cer, pvk, and pfx file?
  2. How to solve “Kernel panic – not syncing – Attempted to kill init” — without erasing any user data
  3. Is it possible to decrypt SHA1
  4. Error `sec_error_revoked_certificate` when viewed in Firefox only
  5. Convert .pfx to .cer
  6. How can bcrypt have built-in salts?
  7. Why should I use the esc_url?
  8. Where to securely store API keys and passwords in WordPress?
  9. Why escape if the_content isnt?
  10. Full path disclosure on rss-functions.php
  11. What to use instead of wp_kses() in user output
  12. Are the default salts secure?
  13. is_email() VS sanitize_email()
  14. Subscribe to email for security fixes?
  15. How to escape custom css?
  16. Understanding SVG vulnerabilities in WordPress related to a specific fix
  17. Moving wp-config.php: Can this be done after site launch?
  18. How to secure or disable the RSS feeds?
  19. Make password invalid once logged out of password-protected page
  20. How to get WordPress to save upload file beyond web root [closed]
  21. Is security a problem in WordPress?
  22. Moving wordpress out of the public directory
  23. Logout via Subdomain, non-wordpress page on a different server?
  24. Protecting HTML5 video [closed]
  25. How can I tell who changed the password?
  26. Does WP show me if I’m logged in from multiple locations?
  27. WordPress website Security [closed]
  28. Do I need to use the esc_html() function on hard coded links?
  29. Can’t reset WordPress password
  30. Is the “lost password” feature truly a vulnerability?
  31. WordPress Malware Problem help! [duplicate]
  32. Frontend Password change
  33. Is it possible to reduce the minimum character length for passwords?
  34. Handling email piping attachments and detecting unsupported file types
  35. Downloading File from Outside Web Root
  36. site get login attempts after htaccess ip restriction
  37. Is it good security advice to install wordpress in subdirectory but link to root?
  38. Why was my blog post inserted lot’s of ad links by others?
  39. Moving wp-config.php up 2 levels
  40. How Could I sanitize the receive data from this code
  41. WordPress SQL Injections through User Agent
  42. Should I Worry About SQL Injection When Using wp_insert_post?
  43. Is there a way for a user to have an alias?
  44. How to prevent wp-login brute force attack from thousand of different IP? [duplicate]
  45. What permissions should I give directories if I want to make WordPress more secure?
  46. Security threat with `home_url`?
  47. When is wp_set_password() called or how to capture a password
  48. How to protect wp-admin through .htaccess?
  49. Something is unescaping all html entities before output to browser [closed]
  50. Frequently getting attacks on admin-ajax.php, wp-cron.php, xmlrpc.php and wp-login.php
  51. How to get WordPress to send Password Reset Link Email instead of New Password?
  52. Verifying that I have fully removed a WordPress hack?
  53. Large Session Tokens
  54. How to change permissions of WordPress and/or apache on macOS securely?
  55. Using an Encryption class in a WordPress Plugin
  56. Limit Login Attempts BEFORE PHP is executed?
  57. Safe to say WordPress security releases don’t have database upgrades
  58. Config file with no Keys..?
  59. How much should I worry about these messages?
  60. Security concerns with external links
  61. Uploading .webm format on WordPress results in security guidline breach and fail
  62. fail2ban to prevent Brute Force Attacks on WordPress?
  63. .htaccess password protection bypassed
  64. Session Cookie security questions
  65. How to give the same error message when the wrong password or wrong username is used?
  66. Storing FTP details in wp-config.php
  67. Spam injected in w3 total cache page cache [closed]
  68. How to distinguish between a hack and an encoding error?
  69. Prevent editor from adding script or form
  70. How to change location of wp-config.php to folder or 2 folders up?
  71. How might I sanitize an XML file before WP Import? (Does wordpress verify or clean text when importing from an XML document? )
  72. Finding where a snippet of code is coming from
  73. Remove hacked code – out of ideas! [closed]
  74. Secure Server after configuration
  75. Uploading attachment (pdf) and prevent download for anonymous user
  76. After limiting the access to my wp-login.php by IP through .htaccess, all my password-protected posts stopped working. What’s the best solution now?
  77. Block JSON access over the net
  78. Can someone do something to my website if I posted a snapped image of the header and covered my logo? (On reddit, when explaining a question)
  79. The in-famous Unable to locate WordPress Content directory (wp-content) and the Direct Method
  80. Security: Critical backend outside of wordpress
  81. Advice On How to Backup WordPress
  82. How to check whether a site has been compromised without browsing into it?
  83. My site thinks it’s secure when it is fact not
  84. Is it possible to only have the admin interface bind to the local loopback?
  85. Should I change the default file and folder permissions?
  86. WordPress exploited theme is causing high io load on server
  87. How to rewrite rules for WP-security in Nginx?
  88. How to set custom validation for WordPress Passwords?
  89. Is it a bad idea to CHMOD 777 all the files on your site?
  90. Default installation permissions for wp-config.php
  91. Correct setup to block file modifications from hackers
  92. Is my WP site being hacked?
  93. Directory to store secure file
  94. How can I give someone server access to only duplicate and modify a site?
  95. WP-JSON: Cross Origin Resource Sharing Vulnerability?
  96. How can I implement ansible with per-host passwords, securely?
  97. Why should I firewall servers?
  98. Does drilling a hole into a hard drive suffice to make its data unrecoverable?
  99. Can you alter the default wordpress strong password requirements?
  100. how to sanitizing $_POST with the correct way?