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CVE-2018-5142

If Media Capture and Streams API permission is requested from documents with "data:" or "blob:" URLs, the permission notifications do not…

Medium5.3EPSS 1.2%
Published
Updated
Reserved
Assigned by
mozilla

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.

Timeline

  1. ID reserved

    By mozilla

  2. · 5 months later

    Published

  3. · 6 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2018-5142, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0Medium5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS (exploitation in 30 days)
1.2% · top 32% of all CVEs (8 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Weakness

  • Media Capture and Streams API permissions display incorrect origin with data: and blob: URLs

Affected products

References (5)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .