# CVE-2018-12397: firefox: A WebExtension can request access to local files without the warning prompt stating that the extension will "Access y...

CVE-2018-12397 is fixed in 4 products on 1 platform, first by firefox 63.0+build2-0ubuntu0.18.04.2, released October 23, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-12397
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0037
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 23, 2018

## Description

A WebExtension can request access to local files without the warning prompt stating that the extension will "Access your data for all websites" being displayed to the user. This allows extensions to run content scripts in local pages without permission warnings when a local file is opened. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 63.0+build2-0ubuntu0.18.04.2 | [firefox 63.0+build2-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-63.0-build2-0ubuntu0.18.04.2.md) | Oct 23, 2018 |
| Linux | firefox-globalmenu Ubuntu 18.04.6 LTS (bionic) | 63.0+build2-0ubuntu0.18.04.2 | [firefox-globalmenu 63.0+build2-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-globalmenu-63.0-build2-0ubuntu0.18.04.2.md) | Oct 23, 2018 |
| Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 63.0+build2-0ubuntu0.18.04.2 | [firefox-mozsymbols 63.0+build2-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-63.0-build2-0ubuntu0.18.04.2.md) | Oct 23, 2018 |
| Linux | firefox-testsuite Ubuntu 18.04.6 LTS (bionic) | 63.0+build2-0ubuntu0.18.04.2 | [firefox-testsuite 63.0+build2-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-testsuite-63.0-build2-0ubuntu0.18.04.2.md) | Oct 23, 2018 |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo