CVE-2018-5166

critical

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

9.5

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.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2018-5166

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201805-10

OS impact

OS	Version	Status	Fixed in
arch		fixed	`60.0-1`
debian	sid	fixed	`60.0-1`

References

https://security.archlinux.org/ASA-201805-10
https://security-tracker.debian.org/tracker/CVE-2018-5166

Verify integrity in audit chain (admin only). AS-IS.