diff --git a/src/dialogs/FallbackAuth.cpp b/src/dialogs/FallbackAuth.cpp
new file mode 100644
index 00000000..a0633c1e
--- /dev/null
+++ b/src/dialogs/FallbackAuth.cpp
@@ -0,0 +1,69 @@
+#include <QDesktopServices>
+#include <QLabel>
+#include <QPushButton>
+#include <QUrl>
+#include <QVBoxLayout>
+
+#include "dialogs/FallbackAuth.h"
+
+#include "Config.h"
+#include "MatrixClient.h"
+
+using namespace dialogs;
+
+FallbackAuth::FallbackAuth(const QString &authType, const QString &session, QWidget *parent)
+ : QWidget(parent)
+{
+ setAutoFillBackground(true);
+ setWindowFlags(Qt::Tool | Qt::WindowStaysOnTopHint);
+ setWindowModality(Qt::WindowModal);
+ setAttribute(Qt::WA_DeleteOnClose, true);
+
+ auto layout = new QVBoxLayout(this);
+ layout->setSpacing(conf::modals::WIDGET_SPACING);
+ layout->setMargin(conf::modals::WIDGET_MARGIN);
+
+ auto buttonLayout = new QHBoxLayout();
+ buttonLayout->setSpacing(8);
+ buttonLayout->setMargin(0);
+
+ openBtn_ = new QPushButton(tr("Open Fallback in Browser"), this);
+ cancelBtn_ = new QPushButton(tr("Cancel"), this);
+ confirmBtn_ = new QPushButton(tr("Confirm"), this);
+ confirmBtn_->setDefault(true);
+
+ buttonLayout->addStretch(1);
+ buttonLayout->addWidget(openBtn_);
+ buttonLayout->addWidget(cancelBtn_);
+ buttonLayout->addWidget(confirmBtn_);
+
+ QFont font;
+ font.setPointSizeF(font.pointSizeF() * conf::modals::LABEL_MEDIUM_SIZE_RATIO);
+
+ auto label = new QLabel(
+ tr("Open the fallback, follow the steps and confirm after completing them."), this);
+ label->setFont(font);
+
+ layout->addWidget(label);
+ layout->addLayout(buttonLayout);
+
+ connect(openBtn_, &QPushButton::clicked, [session, authType]() {
+ const auto url = QString("https://%1:%2/_matrix/client/r0/auth/%4/"
+ "fallback/web?session=%3")
+ .arg(QString::fromStdString(http::client()->server()))
+ .arg(http::client()->port())
+ .arg(session)
+ .arg(authType);
+
+ QDesktopServices::openUrl(url);
+ });
+
+ connect(confirmBtn_, &QPushButton::clicked, this, [this]() {
+ emit confirmation();
+ emit close();
+ });
+ connect(cancelBtn_, &QPushButton::clicked, this, [this]() {
+ emit cancel();
+ emit close();
+ });
+}
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