Open Redirect in Mozilla Firefox
CVE-2025-55031
Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport. An attacker within Bluetooth range could have used this to trick the user into using their passkey to log the attacker's comp…
Vulnerability class: Open Redirect
EPSS: 0.004 (33.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Mozilla Firefox
- Mozilla Firefox_focus
- Mozilla Firefox For Ios — versions 142
- Mozilla Focus For Ios — versions 142
Weakness classification (CWE)
References
- security@mozilla.org (Permissions Required, Issue Tracking)
- security@mozilla.org (Permissions Required, Issue Tracking)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-55031?
- CVE-2025-55031 is a critical-severity vulnerability in Mozilla Firefox, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 9.8/10. Published 2025-08-19.
- How severe is CVE-2025-55031?
- Critical severity. CVSS v3 base score is 9.8 out of 10.