Vulnerabilities

Mozilla developers and community members reported memory safety bugs present in Firefox 66, Firefox ESR 60.6, and Thunderbird 60.6.

Mozilla developers and community members reported memory safety bugs present in Firefox 66.

If hyperthreading is not disabled, a timing attack vulnerability exists, similar to previous Spectre attacks.

A possible vulnerability exists where type confusion can occur when manipulating JavaScript objects in object groups, allowing for the bypassing of security checks within these groups.

Images from a different domain can be read using a canvas object in some circumstances.

A race condition is present in the crash generation server used to generate data for the crash reporter.

A vulnerability where a JavaScript compartment mismatch can occur while working with the fetch API, resulting in a potentially exploitable crash.

A use-after-free vulnerability can occur in the chrome event handler when it is freed while still in use.

A use-after-free vulnerability can occur in AssertWorkerThread due to a race condition with shared workers.

A use-after-free vulnerability can occur when working with XMLHttpRequest (XHR) in an event loop, causing the XHR main thread to be called after it has been freed.

A use-after-free vulnerability can occur when listeners are removed from the event listener manager while still in use, resulting in a potentially exploitable crash.

The bufferdata function in WebGL is vulnerable to a buffer overflow with specific graphics drivers on Linux.

A vulnerability exists in the Windows sandbox where an uninitialized value in memory can be leaked to a renderer from a broker when making a call to access an otherwise unavailable file.

A custom cursor defined by scripting on a site can position itself over the addressbar to spoof the actual cursor when it should not be allowed outside of the primary web content area.

Files with the .JNLP extension used for "Java web start" applications are not treated as executable content for download prompts even though they can be executed if Java is installed on the local system.

If the ALT and "a" keys are pressed when users receive an extension installation prompt, the extension will be installed without the install prompt delay that keeps the prompt visible in order for users to accept or decl…

If a crafted hyperlink is dragged and dropped to the bookmark bar or sidebar and the resulting bookmark is subsequently dragged and dropped into the web content area, an arbitrary query of a user's browser history can be…

A malicious page can briefly cause the wrong name to be highlighted as the domain name in the addressbar during page navigations.

A hyperlink using the res: protocol can be used to open local files at a known location in Internet Explorer if a user approves execution when prompted.

The default webcal: protocol handler will load a web site vulnerable to cross-site scripting (XSS) attacks.