KAD,
в типовой блок:
$oComment->parent_id = intval(Core_Array::getPost('parent_id', 0));
$oComment->active = Core_Array::get(Core_Page::instance()->libParams, 'addedCommentActive', 1) == 1 ? 1 : 0;
$oComment->author = Core_Str::stripTags(Core_Array::getPost('author'));
$oComment->email = Core_Str::stripTags(Core_Array::getPost('email'));
$oComment->phone = Core_Str::stripTags(Core_Array::getPost('phone'));
$oComment->grade = intval(Core_Array::getPost('grade', 0));
$oComment->subject = Core_Str::stripTags(Core_Array::getPost('subject'));
$oComment->text = nl2br(Core_Str::stripTags(Core_Array::getPost('text'), $allowable_tags));
$oComment->siteuser_id = $siteuser_id;
$oInformationsystem_Item = Core_Entity::factory('Informationsystem_Item', $Informationsystem_Controller_Show->item);
$oXmlCommentTag
->addEntity($oComment)
->addEntity($oInformationsystem_Item);
замените на
$allowable_tags = '<b><strong><i><em><br><p><u><strike><ul><ol><li>';
$oComment->parent_id = intval(Core_Array::getPost('parent_id', 0));
$oComment->active = Core_Array::get(Core_Page::instance()->libParams, 'addedCommentActive', 1) == 1 ? 1 : 0;
$oComment->author = Core_Str::stripTags(Core_Array::getPost('author'));
$oComment->email = Core_Str::stripTags(Core_Array::getPost('email'));
$oComment->phone = Core_Str::stripTags(Core_Array::getPost('phone'));
$oComment->grade = intval(Core_Array::getPost('grade', 0));
$oComment->subject = Core_Str::stripTags(Core_Array::getPost('subject'));
$oComment->text = Core_Str::stripTags(Core_Array::getPost('text'), $allowable_tags);
$oComment->siteuser_id = $siteuser_id;
$oInformationsystem_Item = Core_Entity::factory('Informationsystem_Item', $Informationsystem_Controller_Show->item);
$oXmlCommentTag
->addEntity(clone $oComment)
->addEntity($oInformationsystem_Item);
$oComment->text = nl2br($oComment->text);