CVE-2018-18497

critical

Published — · Modified —

CVSS v3

—

CVSS v2

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VIR risk

9.5

Description

Limitations on the URIs allowed to WebExtensions by the browser.windows.create API can be bypassed when a pipe in the URL field is used within the extension to load multiple pages as a single argument. This could allow a malicious WebExtension to open privileged about: or file: locations. 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-2018-18497

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2018-18497.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-2018-18497.html
https://security-tracker.debian.org/tracker/CVE-2018-18497

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