Severity Low Description When a user types a new URL for the browser to load, the currently active page may detect when the new page is about to load and prevent the navigation, while still leaving the new URL displayed in the address bar. This can then be used to spoof the URL of the…
Severity Moderate Description When a user is interacting with a window, that window should be visible to the user, to ensure that the user realizes it is there. If a page is displayed in a small enough window, the user may not realize it is being displayed, and if the right keyboard sequence is carefully…
Severity Moderate Description When a user double clicks on a page, they may expect the two clicks to target the same object. If a page uses the first click to open a pop-up window in a predictable location, the second click may focus parts of the new window, such as its address field. If the…
Severity Moderate Description JSON strings are sometimes exported by sites as a resource that cannot be read cross-domain, and may contain confidential data. The format of a JSON string ensures that it cannot be read as the contents of a variable, if it is included as a normal script. In some cases, Opera does not…
Severity Low Description The address field should always show the address of the page that is being displayed. Certain types of navigation, combined with reloads and redirects to a slowly-responding target site can cause the address field to show the target site’s address, while the attacking site is still being displayed. Opera’s Response Opera Software…
Severity Low Description When pages are printed by Opera, a temporary file is created, which contains the document to print. This document is not created with the correct permissions, allowing other users of the system to read its contents. When printed with certain popular printing frameworks, an additional temporary file is created by the framework…
Severity Low Description The address field should always show the address of the page that is being displayed. In certain cases, if a target site responds slowly, reloading an attacking page and redirecting to the target page can cause the address field to show the target site’s address, while the attacking site is still being…
Severity Low Description The address field should always show the correct address for the page that is loaded. If a page can cause Opera to display certain dialogs relating to a target site, the dialog may in some cases cause Opera to display the target site’s address instead of the correct address. This can allow…
Severity Low Description When a site uses history.pushState and history.replaceState to add or replace history entries, it can also provide optional data, which may typically be used to restore the given state when the user navigates through their browser history. When pages with cross-domain frames use this functionality, Opera does not restrict that state data…
Severity High Description Dialogs such as the download dialog are usually displayed on top of page content, to ensure that the user knows that the dialog is requesting attention. In some cases, this policy was not implemented correctly in Opera, allowing certain page content to overlay the dialog. In these cases, clicking the page content…
