What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-06-02 · updated 2026-06-17
• Weakness: CWE-863

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.

Affected products

• Mozilla Firefox: before 109.0 — fixed in 109.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 109.0. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2023-23604 or the next vulnerability affects your stack