CVE-2023-23597: Logic bug in process allocation allowed to read arbitrary files

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% 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-326

Description

A compromised web child process could disable web security opening restrictions, leading to a new child process being spawned within the `file://` context. Given a reliable exploit primitive, this new process could be exploited again leading to arbitrary file read. 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=1538028
https://www.mozilla.org/security/advisories/mfsa2023-01/
https://bugzilla.mozilla.org/show_bug.cgi?id=1538028
https://www.mozilla.org/security/advisories/mfsa2023-01/

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