[4.19.2] - 2026-10-08

Subresource Integrity

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<script
  crossorigin="anonymous"
  integrity="sha384-ERvWMqZ/DEbYmsceJGEv19b+JMB1Z7LdOWfTmNqxR+CoSPu9K4IrStj7AJ9oqhgM"
  src="https://github.com/microsoft/BotFramework-WebChat/releases/download/v4.19.2/webchat.js"
></script>

<script
  crossorigin="anonymous"
  integrity="sha384-9Lgcr0JMafYUZ3cTDrfbd5z+qdjKX83cV+nf7x/rSE5OAySwf/hRaMtYK2B8KMxi"
  src="https://github.com/microsoft/BotFramework-WebChat/releases/download/v4.19.2/webchat-es5.js"
></script>

<script
  crossorigin="anonymous"
  integrity="sha384-QAcLvzyinyE4D/JsoYeB0W0Atv9s9bOshNt/n9SpqisN9W/yGfFcqkrHFztczYwY"
  src="https://github.com/microsoft/BotFramework-WebChat/releases/download/v4.19.2/webchat-minimal.js"
></script>

Changelog

[4.19.2] - 2026-10-08

Added

• Added styleOptions.richCardTitleOmitHeadingRole (default false) to opt out of style: 'heading' on rich card titles, in PR #5839, by @cjennison
• Added support of Adaptive Cards Action.Submit action with msteams/signin sub-action to open sign-in link in a popup window, in PR #5860, by @compulim
  • Added styleOptions.adaptiveCardSignInActionPopupWindowHeight/Width for sizing the sign-in popup window
  • Link to Adaptive Cards spec
  • Refer to this test for the reference payload
  • Note: this implementation is based on observation of how Microsoft Teams behave and could deviate from their official implementation
  • Obsoleted in favor of PR #5862
• Added card action webchat:callURL and Adaptive Card action Action.OpenUrlDialog
  • The card action is designed to host popup for authentication and authorization (call-and-return pattern), it can optionally send a postback message to the bot
  • Open in popup, in PR #5862, by @compulim
    • Added styleOptions.callURLActionPopupWindowHeight/Width for sizing the popup window
    • URL must be absolute with scheme of either http:// or https://
    • Reference payload for Direct Line webchat:callURL card action can be found in this test
    • Reference payload for Adaptive Card Action.OpenUrlDialog can be found in this test
    • Note: the Adaptive Card implementation is based on observation of how other apps behave and could deviate from their official implementation
    • Adaptive Card: dialogHeight, dialogTitle, and dialogWidth are ignored, use styleOptions.callURLActionPopupWindowHeight/Width for dialog sizing instead
  • Trusted popup can send postback message, in PR #5863, by @compulim
    • Popup window can be opened as trusted or untrusted based on their origin
      • Trusted popup will have access to window.opener and can send postback value
      • Untrusted popup will be opened with noopener noreferrer and they cannot send postback value
    • Same origin is always trusted, multiple cross origins can be trusted via the new styleOptions.callURLActionTrustedOrigin style option
    • Content in trusted popup could potentially access data and manipulate the page in the origin where Web Chat is hosted. Content must be well-maintained and frequently audited. In a trusted popup, never redirect to an untrusted cross origin
    • To send a postback value, call window.opener.postMessage({ type: 'postback', value: {} | string }, '...')
      • Postback is only accepted within 5 minutes after the popup window is opened and from a trusted origin
      • Each popup window can only send at most one postback, subsequent postbacks are ignored
      • replyToId will be automatically filled in by the ID of the originating activity

Fixed

• Fixed an error when a failed activity is present when Web Chat mounts, resolving #5812, in PR #5848, by @OEvgeny