Mozilla: MediaError message property could have leaked information about cross-origin resources

When trying to load a cross-origin resource in an audio/video context a decoding error may have resulted, and the content of that error may have revealed information about the resource. This vulnerability affects Firefox 86, Thunderbird 78.8, and Firefox ESR 78.8...

CVE-2020-15666

When trying to load a non-video in an audio/video context the exact status code 200, 302, 404, 500, 412, 403, etc. was disclosed via the MediaError Message. This level of information leakage is inconsistent with the standardized onerror/onsuccess disclosure and can lead to inferring login status ...

UBUNTU-CVE-2020-15666

When trying to load a non-video in an audio/video context the exact status code 200, 302, 404, 500, 412, 403, etc. was disclosed via the MediaError Message. This level of information leakage is inconsistent with the standardized onerror/onsuccess disclosure and can lead to inferring login status ...