29 files declare their use of ConfirmFormBase in Drupal 8

BanDelete.php in core/modules/ban/src/Form/BanDelete.php

BookRemoveForm.php in core/modules/book/src/Form/BookRemoveForm.php

ConfigSingleImportForm.php in core/modules/config/src/Form/ConfigSingleImportForm.php

ConfigTranslationDeleteForm.php in core/modules/config_translation/src/Form/ConfigTranslationDeleteForm.php

ConfirmFormTestForm.php in core/modules/system/tests/modules/form_test/src/ConfirmFormTestForm.php

DblogClearLogConfirmForm.php in core/modules/dblog/src/Form/DblogClearLogConfirmForm.php

DeleteForm.php in core/modules/forum/src/Form/DeleteForm.php

DeleteMultipleForm.php in core/lib/Drupal/Core/Entity/Form/DeleteMultipleForm.php

DiscardLayoutChangesForm.php in core/modules/layout_builder/src/Form/DiscardLayoutChangesForm.php

ImageEffectDeleteForm.php in core/modules/image/src/Form/ImageEffectDeleteForm.php

LayoutBuilderDisableForm.php in core/modules/layout_builder/src/Form/LayoutBuilderDisableForm.php

LayoutRebuildConfirmFormBase.php in core/modules/layout_builder/src/Form/LayoutRebuildConfirmFormBase.php

MediaDeleteMultipleConfirmForm.php in core/modules/media/src/Form/MediaDeleteMultipleConfirmForm.php

MenuLinkResetForm.php in core/modules/menu_ui/src/Form/MenuLinkResetForm.php

ModulesListConfirmForm.php in core/modules/system/src/Form/ModulesListConfirmForm.php

ModulesUninstallConfirmForm.php in core/modules/system/src/Form/ModulesUninstallConfirmForm.php

NegotiationBrowserDeleteForm.php in core/modules/language/src/Form/NegotiationBrowserDeleteForm.php

NodeRevisionDeleteForm.php in core/modules/node/src/Form/NodeRevisionDeleteForm.php

NodeRevisionRevertForm.php in core/modules/node/src/Form/NodeRevisionRevertForm.php

PrepareModulesEntityUninstallForm.php in core/modules/system/src/Form/PrepareModulesEntityUninstallForm.php

RebuildPermissionsForm.php in core/modules/node/src/Form/RebuildPermissionsForm.php

ReindexConfirm.php in core/modules/search/src/Form/ReindexConfirm.php

RevertOverridesForm.php in core/modules/layout_builder/src/Form/RevertOverridesForm.php

SwitchToLiveForm.php in core/modules/workspaces/src/Form/SwitchToLiveForm.php

ThemeExperimentalConfirmForm.php in core/modules/system/src/Form/ThemeExperimentalConfirmForm.php

UserMultipleCancelConfirm.php in core/modules/user/src/Form/UserMultipleCancelConfirm.php

WorkflowStateDeleteForm.php in core/modules/workflows/src/Form/WorkflowStateDeleteForm.php

WorkflowTransitionDeleteForm.php in core/modules/workflows/src/Form/WorkflowTransitionDeleteForm.php

WorkspaceMergeForm.php in core/modules/workspaces/src/Form/WorkspaceMergeForm.php