CVE-2024-11023: Google Firebase JavaScript SDK

Medium severity, CVSS 6.1. EPSS: 0.1% chance of exploitation in the next 30 days.

Firebase JavaScript SDK utilizes a "FIREBASE_DEFAULTS" cookie to store configuration data, including an "_authTokenSyncURL" field used for session synchronization. If this cookie field is preset via an attacker by any other method, the attacker can manipulate the "_authTokenSyncURL" to point to their own server and it would allow an actor to capture user session data transmitted by the SDK. We recommend upgrading Firebase JS SDK at least to 10.9.0.

Affected products

• Google Firebase JavaScript SDK: before 10.9.0 (fixed in 10.9.0)

Published 2024-11-18. Last modified 2026-06-17.