CVE-2018-18497

6.5 mediumEPSS 1.6%

Medium (6.5). EPSS 1.6% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.0

6.5 medium

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS: 1.6% chance of exploitation in the next 30 days; higher than 76% of CVEs (scores of 2026-10-31)
Published: 2019-02-28
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

canonical:ubuntu_linux
mozilla:firefox

References

http://www.securityfocus.com/bid/106167
https://bugzilla.mozilla.org/show_bug.cgi?id=1488180
https://usn.ubuntu.com/3844-1/
https://www.mozilla.org/security/advisories/mfsa2018-29/
http://www.securityfocus.com/bid/106167

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