CVE-2018-5116

CRITICAL

Firefox < 58 - Origin Validation Error via WebExtensions ActiveTab Permission

Title source: llm

Description

WebExtensions with the "ActiveTab" permission are able to access frames hosted within the active tab even if the frames are cross-origin. Malicious extensions can inject frames from arbitrary origins into the loaded page and then interact with them, bypassing same-origin user expectations with this permission. This vulnerability affects Firefox < 58.

References (5)

Core 5

Core References

Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack

http://www.securitytracker.com/id/1040270

Issue Tracking, Permissions Required x_refsource_confirm

https://bugzilla.mozilla.org/show_bug.cgi?id=1396399

Third Party Advisory vendor-advisory x_refsource_ubuntu

https://usn.ubuntu.com/3544-1/

Third Party Advisory, VDB Entry vdb-entry x_refsource_bid

http://www.securityfocus.com/bid/102786

Vendor Advisory x_refsource_confirm

https://www.mozilla.org/security/advisories/mfsa2018-02/

Scores

CVSS v3 9.8

EPSS 0.0046

EPSS Percentile 64.4%

Attack Vector NETWORK

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

Details

CWE

CWE-346

Status published

Products (4)

canonical/ubuntu_linux 14.04

canonical/ubuntu_linux 16.04

canonical/ubuntu_linux 17.10

mozilla/firefox < 57.0.4

Published Jun 11, 2018

Tracked Since Feb 18, 2026