CVE-2018-18497
firefox: WebExtensions can load arbitrary URLs through pipe separators
Severity
ModerateRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · December 11, 2018
Updated · June 27, 2026
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.
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 · 6.5CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE-939 · Improper Authorization in Handler for Custom URL Scheme