CVE-2017-5386

HighCVSS 7.3/10Last modified Jun 17, 2026

Description

WebExtension scripts can use the "data:" protocol to affect pages loaded by other web extensions using this protocol, leading to potential data disclosure or privilege escalation in affected extensions. This vulnerability affects Firefox ESR < 45.7 and Firefox < 51.

Metrics

CVSS 3.0 7.3/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected software

No affected versions have been published.

Timeline

Published: Jun 11, 2018
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2017

CVE-2017-53873.3The existence of a specifically requested local file can be found due to the double firing of the "onerror" when the "source" attribute on a CVE-2017-53887.5A STUN server in conjunction with a large number of "webkitRTCPeerConnection" objects can be used to send large STUN packets in a short peri CVE-2017-53896.1WebExtensions could use the "mozAddonManager" API by modifying the CSP headers on sites with the appropriate permissions and then using host CVE-2017-53909.8The JSON viewer in the Developer Tools uses insecure methods to create a communication channel for copying and viewing JSON or HTTP headers CVE-2017-53919.8Special "about:" pages used by web content, such as RSS feeds, can load privileged "about:" pages in an iframe. If a content-injection bug w CVE-2017-53929.8Weak proxy objects have weak references on multiple threads when they should only have them on one, resulting in incorrect memory usage and CVE-2017-53936.1The "mozAddonManager" allows for the installation of extensions from the CDN for addons.mozilla.org, a publicly accessible site. This could CVE-2017-53948.8A location bar spoofing attack where the location bar of loaded page will be shown over the content of another tab due to a series of JavaSc CVE-2017-53954.3Malicious sites can display a spoofed location bar on a subsequently loaded page when the existing location bar on the new page is scrolled CVE-2017-53969.8A use-after-free vulnerability in the Media Decoder when working with media files when some events are fired after the media elements are fr CVE-2017-53979.8The cache directory on the local file system is set to be world writable. Firefox defaults to extracting libraries from this cache. This all CVE-2017-53989.8Memory safety bugs were reported in Thunderbird 45.7. Some of these bugs showed evidence of memory corruption and we presume that with enoug