CVE-2018-5142

Name: CVE-2018-5142
Creator: NVD / NIST
Published: 2018-06-11T21:29:14.607+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.21%

Last modified Jun 17, 2026

CVE-2018-5142 is a vulnerability of currently unknown severity. If Media Capture and Streams API permission is requested from documents with "data:" or "blob:" URLs, the permission notifications do not properly display the originating domain. The notification states "Unknown protocol" as the requestee, leading to user confusion about which site is asking for this permission. EPSS estimates a 1.21% chance of exploitation in the next 30 days.

Description

If Media Capture and Streams API permission is requested from documents with "data:" or "blob:" URLs, the permission notifications do not properly display the originating domain. The notification states "Unknown protocol" as the requestee, leading to user confusion about which site is asking for this permission. This vulnerability affects Firefox < 59.

Metrics

EPSS Probability

1.21%

64.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 59.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	17.10

References

http://www.securityfocus.com/bid/103386Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040514Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1366357Permissions Required
https://usn.ubuntu.com/3596-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-06/Vendor Advisory
http://www.securityfocus.com/bid/103386Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040514Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1366357Permissions Required
https://usn.ubuntu.com/3596-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-06/Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2018-5142?

How severe is CVE-2018-5142?

Severity scoring for CVE-2018-5142 is pending analysis. The EPSS model estimates a 1.21% probability of exploitation in the next 30 days.

How do I fix CVE-2018-5142?

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-2018-5142?

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

Scan your code now

Source: NVD / NIST