CVE-2018-18497
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.
Does this matter?
Lower severity and a low EPSS score (1.65%). Track it; it rarely justifies an emergency change on its own.
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 3.0
- 6.5 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- EPSS
- 1.65% probability · 76th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- mozilla/firefox · canonical/ubuntu linux
- Source
- security@mozilla.org
EPSS 1.6% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/106167Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1488180Issue Tracking, Permissions Required, Vendor Advisory
- https://usn.ubuntu.com/3844-1/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-29/Vendor Advisory
- http://www.securityfocus.com/bid/106167Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1488180Issue Tracking, Permissions Required, Vendor Advisory
- https://usn.ubuntu.com/3844-1/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-29/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.