# CVE-2018-18497: firefox: Limitations on the URIs allowed to WebExtensions by the browser.windows.create API can be bypassed when a pipe in the...

CVE-2018-18497 is fixed in 4 products on 1 platform, first by firefox 64.0+build3-0ubuntu0.18.04.1, released December 10, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-18497
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0165
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 10, 2018

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 64.0+build3-0ubuntu0.18.04.1 | [firefox 64.0+build3-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-64.0-build3-0ubuntu0.18.04.1.md) | Dec 10, 2018 |
| Linux | firefox-globalmenu Ubuntu 18.04.6 LTS (bionic) | 64.0+build3-0ubuntu0.18.04.1 | [firefox-globalmenu 64.0+build3-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-globalmenu-64.0-build3-0ubuntu0.18.04.1.md) | Dec 10, 2018 |
| Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 64.0+build3-0ubuntu0.18.04.1 | [firefox-mozsymbols 64.0+build3-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-64.0-build3-0ubuntu0.18.04.1.md) | Dec 10, 2018 |
| Linux | firefox-testsuite Ubuntu 18.04.6 LTS (bionic) | 64.0+build3-0ubuntu0.18.04.1 | [firefox-testsuite 64.0+build3-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-testsuite-64.0-build3-0ubuntu0.18.04.1.md) | Dec 10, 2018 |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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