CVE-2018-12402

The internal WebBrowserPersist code does not use correct origin context for a resource being saved. This manifests when sub-resources are loaded as part of "Save Page As..." functionality. For example, a malicious page could recover a visitor's Windows username and NTLM hash by including resources otherwise unreachable to the malicious page, if they can convince the visitor to save the complete web page. Similarly, SameSite cookies are sent on cross-origin requests when the "Save Page As..." menu item is selected to save a page, which can result in saving the wrong version of resources based on those cookies. This vulnerability affects Firefox < 63.

• CWE-346

• http://www.securityfocus.com/bid/105721Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1041944Third Party Advisory, VDB Entry
• https://bugzilla.mozilla.org/show_bug.cgi?id=1447087Issue Tracking, Permissions Required, Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1469916Issue Tracking, Permissions Required, Vendor Advisory
• https://usn.ubuntu.com/3801-1/Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2018-26/Vendor Advisory
• http://www.securityfocus.com/bid/105721Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1041944Third Party Advisory, VDB Entry
• https://bugzilla.mozilla.org/show_bug.cgi?id=1447087Issue Tracking, Permissions Required, Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1469916Issue Tracking, Permissions Required, Vendor Advisory
• https://usn.ubuntu.com/3801-1/Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2018-26/Vendor Advisory

Published

Feb 28, 2019

Last Modified

Jun 17, 2026

Status

Modified