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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Feb 28, 2019 |
| Freebsd | — | Upgrade firefox-esrUpgrade linux-thunderbirdUpgrade thunderbirdUpgrade firefoxUpgrade libxulUpgrade linux-firefoxUpgrade seamonkeyUpgrade waterfoxUpgrade linux-seamonkey | Dec 12, 2018 | Dec 11, 2018 |
| Mfsa2018 29 | — | Upgrade to Mozilla Firefox version 64.0Upgrade to the latest version of Mozilla Firefox | Dec 12, 2018 | Dec 11, 2018 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 28, 2019 |
| Ubuntu | — | Upgrade firefox | Jan 10, 2019 | Dec 11, 2018 |
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