CVE-2023-23604

MEDIUM 6.5

Creation of duplicate SystemPrincipal from less secure contexts

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	mozilla
Product	firefox
Ecosystems	Browser JavaScript
Industries	Technology
Published	Jun 2, 2023
Last Updated	Dec 18, 2025

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Affected Versions

Mozilla / Firefox

unspecified < 109

References

NVD ↗ CVE.org ↗ EPSS Data ↗

bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=1802346 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2023-01/

Credits

Nika Layzell