Is SSL connection of plugins default?

No, this is not something that can be guaranteed, setting up an SSL certificate on your own site and using https: for everything does not guarantee that code that calls to other sites will use https or TLS/SSL. Assuming those remote services even support HTTPS or speak HTTP.

Your SSL certificate is for securing inbound HTTPS communication to your server with an incoming connection, it has nothing to do with outbound connections to 3rd parties and remote hosts.

The only way to be sure is to audit the plugin, code review, and test.

Related Posts:

  1. How can I make an Ajax login form work with FORCE_SSL_ADMIN enabled?
  2. SSL redirect loop using WordPress HTTPS Plugin
  3. Is the WordPress HTTPS Plugin Still Safe To Use? [closed]
  4. Enable Full SSL for WordPress
  5. How can I make uploaded images in the editor load with HTTPS?
  6. How can I force users to a particular subdomain to log in for MU (Multisite)?
  7. How can I fix the mixed content problems of the kk star ratings plugin?
  8. redirected you too many times
  9. How do I convert my WordPress website to be domain agnostic?
  10. Is it safe to use Web Invoice 2.1.0 without SSL?
  11. www redirects to another directory in wordpress
  12. Mixed content error after adding SSL certificate
  13. Site navigation from Google not using HTTPS for some resources, causing redirect loop
  14. Why my multisite is this slow? (stats inside)
  15. How do I locate specific part of code that affects ssl?
  16. How do I secure a subdomain using UCC SSL?
  17. How do I locate specific file in a post that affects ssl?
  18. Theme causing SSL break on chrome
  19. Generate all urls with https
  20. SSL not working for checkout
  21. Sudden ERR_HTTP2_PROTOCOL_ERROR on every JS and CSS files loads
  22. WP Mail SMTP Plugin Fails Certificate Verification [closed]
  23. Problems with autoloading classes via sp_autoload_register / maybe interfering WP-specific autoloader
  24. Advice on naming files for a plugin
  25. For performance is it better to build custom functionality into the theme or a plugin
  26. WordPress tips for speed and performance [closed]
  27. Save and retrieve custom plugin options value
  28. How do I add a widget programmatically to a newly created site (WPMU) within a plugin?
  29. Tracking last login and last visit
  30. Rename existing old uploaded images containing accented French characters (not during upload)
  31. Send batch of posts as HTML Email?
  32. Translate third party plugin and save translation files in custom theme
  33. Trying to add admin file upload form plugin
  34. wp_verify_nonce() why return false?
  35. What’s the best plugin for allowing javascript in a post or page? [closed]
  36. Plugin “Meta Box”: Implementing meta boxes in custom post type
  37. register_theme_directory somehow “fails” when folder is outside of WP-Folder
  38. Disable / Deregister all JS from all plugins
  39. Do extra plugin files get deleted during an upgrade?
  40. WordPress plugin for mail subscriptions [closed]
  41. Plugin allowing for artists, events and venues
  42. Shortcode is not working in homepage page template (custom front page)
  43. Prevent WordPress plugin from connecting to its server
  44. HTML in WooCommerce settings
  45. Redirecting to home page after login as custom role WordPress
  46. Only allowing some email addresses to create an account
  47. Where (or when) should I register a new taxonomy?
  48. Widget with same content across several websites
  49. WordPress plugin compatibility explaination when wordpress releases its new version (theoretical)
  50. Fixing WordPress’s Bug (failed to send buffer of zlib output compression) results in “White Screen of Death”
  51. How to tie dark mode with prefers-color-scheme webkit? [closed]
  52. how to oauth1 Wp plug-in revoke/reset.?
  53. Why can’t I access my Intranet LDAPS with NADI?
  54. qTranslate remove default directory from link
  55. Custom User meta field display
  56. How to split test a menu item
  57. How to use get_template part in the plugin?
  58. How can I use get header from within my plugin?
  59. Bulk Image Upload And Rerrange Functionality
  60. Free shipping for certain items only – or get local pickup as option if item is set to virtual
  61. facebook Page Publish 2
  62. Elementor Gallery issue [closed]
  63. Understanding State in WordPress Multisites
  64. How do I publish portfolio items with a future date?
  65. How to activate a plugin on the activation of a theme?
  66. WordPress stats: OWA plugin overhead in the future
  67. Custom Login Page — wp_signon Headers Already Sent?
  68. What form should the $query media query array have for an Elementor page builder function? [closed]
  69. WooCommerce: Force coupon for existing/registered customers [closed]
  70. How to make a dynamic css class whose name changes every visit to confuse scraper
  71. Deactivation Hook does not remove database
  72. Code not working with post name Permalink Settings Help
  73. WordPress /users/me endpoint request forbidden
  74. Adding a theme option to the admin that lets me turn on/off a javascript file
  75. Echo out element to another page.
  76. Cannot add edit themes and add plugins after multisite update
  77. Janrain/Simple Modal under Redirected Domain
  78. WP REST API GET Method Works But Not The POST Method
  79. WordPress Gutenberg custom block
  80. Working on a product group in wordpress, where user choose how many children, wife and husband
  81. override plugin function in a class not working
  82. JOIN and SUM different statement results (Mailster Database)
  83. Show prices with tax Inclusive in Minicart widget
  84. Adding category base to url in custom post giving 404?
  85. Custom fields not showing up in the user info (PaidMembershipsPro)
  86. Classes registration in WordPress useing woocommers
  87. Problem with checked box on wp car manager plugin
  88. Performing CRUD operations on front end in wordpress
  89. Elementor contact form doesn’t work: “Oops! I cannot send this email!”
  90. Create a link that calls our custom function in WordPress
  91. Woocommerce list variations that are added already to cart in Single Product
  92. {status}_{post_type} does not run correctly?
  93. Upload profil picture to every member
  94. WordPress Theme Conflict With Plugin
  95. Why isn’t my plugin seeing other classes?
  96. Saving custom form fields
  97. set cookies for my whole site is not working
  98. wp_insert_post_data filter to set category
  99. Do shortcodes affect page indexing by search engines?
  100. Please Check this ‘.htaccess’ File