CVE-2017-7840

Name: CVE-2017-7840
Creator: NVD / NIST
Published: 2018-06-11T21:29:11.827+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.14%

Last modified Jun 17, 2026

CVE-2017-7840 is a vulnerability of currently unknown severity. 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. EPSS estimates a 1.14% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

1.14%

62.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	<= 56.0.2

References

http://www.securityfocus.com/bid/101832Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039803Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1366420Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2017-24/Vendor Advisory
http://www.securityfocus.com/bid/101832Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039803Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1366420Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2017-24/Vendor Advisory

Timeline

Published: Jun 11, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-7840?

How severe is CVE-2017-7840?

Severity scoring for CVE-2017-7840 is pending analysis. The EPSS model estimates a 1.14% probability of exploitation in the next 30 days.

How do I fix CVE-2017-7840?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-7840?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST