CVE-2018-18495

critical

Published — · Modified —

CVSS v3

—

CVSS v2

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VIR risk

9.5

Description

WebExtension content scripts can be loaded into about: pages in some circumstances, in violation of the permissions granted to extensions. This could allow an extension to interfere with the loading and usage of these pages and use capabilities that were intended to be restricted from extensions. This vulnerability affects Firefox < 64.

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-2018-18495

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2018-18495.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201812-9

OS impact

OS	Version	Status	Fixed in
arch		fixed	`64.0-1`
sles		affected
debian	sid	fixed	`64.0-1`

References

https://security.archlinux.org/ASA-201812-9
https://www.suse.com/security/cve/CVE-2018-18495.html
https://security-tracker.debian.org/tracker/CVE-2018-18495

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