CVE-2018-5134

HIGH

Firefox < 59.0 - Exposure of Sensitive Information via WebExtensions View-Source URL Bypass

Title source: llm

Description

WebExtensions may use "view-source:" URLs to view local "file:" URL content, as well as content stored in "about:cache", bypassing restrictions that only allow WebExtensions to view specific content. This vulnerability affects Firefox < 59.

References (5)

Core 5

Core References

Third Party Advisory, VDB Entry vdb-entry x_refsource_bid

http://www.securityfocus.com/bid/103386

Permissions Required x_refsource_confirm

https://bugzilla.mozilla.org/show_bug.cgi?id=1429379

Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack

http://www.securitytracker.com/id/1040514

Third Party Advisory vendor-advisory x_refsource_ubuntu

https://usn.ubuntu.com/3596-1/

Vendor Advisory x_refsource_confirm

https://www.mozilla.org/security/advisories/mfsa2018-06/

Scores

CVSS v3 7.5

EPSS 0.0117

EPSS Percentile 78.9%

Attack Vector NETWORK

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CWE

CWE-200

Status published

Products (1)

mozilla/firefox < 59.0

Published Jun 11, 2018

Tracked Since Feb 18, 2026