CVE-2017-7840

Description

JavaScript can be injected into an exported bookmarks file by placing JavaScript code into user-supplied tags in saved bookmarks. If the resulting exported HTML file is later opened in a browser this JavaScript will be executed. This could be used in social engineering and self-cross-site-scripting (self-XSS) attacks if users were convinced to add malicious tags to bookmarks, export them, and then open the resulting file. This vulnerability affects Firefox < 57.

Category

6.1
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.73% Top 30%
Vendor Advisory mozilla.org
Affected: Mozilla Firefox
Published at:
Updated at:

References

Link Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1366420 issue tracking permissions required
https://www.mozilla.org/security/advisories/mfsa2017-24/ vendor advisory
http://www.securityfocus.com/bid/101832 vdb entry third party advisory
http://www.securitytracker.com/id/1039803 vdb entry third party advisory

Frequently Asked Questions

What is the severity of CVE-2017-7840?
CVE-2017-7840 has been scored as a medium severity vulnerability.
How to fix CVE-2017-7840?
To fix CVE-2017-7840, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-7840 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2017-7840 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-7840?
CVE-2017-7840 affects Mozilla Firefox.
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