CVE-2018-5166
Mozilla: WebExtension host permission bypass through filterReponseData
Severity
ModerateRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · May 9, 2018
Updated · November 22, 2025
Description
WebExtensions can use request redirection and a "filterReponseData" filter to bypass host permission settings to redirect network traffic and access content from a host for which they do not have explicit user permission. This vulnerability affects Firefox < 60.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.0 · 7.5CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-266 · Incorrect Privilege Assignment