# CVE-2023-23604: Creation of duplicate SystemPrincipal from less secure contexts

CVE-2023-23604 is fixed in 5 products on 2 platforms, first by Mozilla Firefox (en-US) 109.0, released January 17, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-23604
- Priority: Routine
- CVSS: 6.5 (Medium)
- EPSS: 0.0046
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 17, 2023
- Weakness: CWE-863: Incorrect Authorization
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-23604

## Description

A duplicate `SystemPrincipal` object could be created when parsing a non-system html document via `DOMParser::ParseFromSafeString`. This could have lead to bypassing web security checks. This vulnerability affects Firefox < 109.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Firefox (en-US) | 109.0 | [Mozilla Firefox (en-US) 109.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox-109.0.md) | Jan 17, 2023 |
| Windows apps | Mozilla Firefox ESR (en-US) | 115.4.0 | [Mozilla Firefox ESR (en-US) 115.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-115.4.0.md) | Oct 17, 2023 |
| Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 109.0+build2-0ubuntu0.18.04.1 | [firefox 109.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-109.0-build2-0ubuntu0.18.04.1.md) | Jan 17, 2023 |
| Linux | firefox Ubuntu 20.04 LTS (focal) | 109.0+build2-0ubuntu0.20.04.1 | [firefox 109.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-109.0-build2-0ubuntu0.20.04.1.md) | Jan 17, 2023 |
| Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 109.0+build2-0ubuntu0.18.04.1 | [firefox-geckodriver 109.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-109.0-build2-0ubuntu0.18.04.1.md) | Jan 17, 2023 |
| Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 109.0+build2-0ubuntu0.20.04.1 | [firefox-geckodriver 109.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-109.0-build2-0ubuntu0.20.04.1.md) | Jan 17, 2023 |
| Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 109.0+build2-0ubuntu0.18.04.1 | [firefox-mozsymbols 109.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-109.0-build2-0ubuntu0.18.04.1.md) | Jan 17, 2023 |
| Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 109.0+build2-0ubuntu0.20.04.1 | [firefox-mozsymbols 109.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-109.0-build2-0ubuntu0.20.04.1.md) | Jan 17, 2023 |

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Data as of 2026-11-08T06:59:42Z 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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