Vulnerability in Mozilla Firefox
CVE-2025-1939
Android apps can load web pages using the Custom Tabs feature. This feature supports a transition animation that could have been used to trick a user into granting sensitive permissions by hiding what the user was actually clicking. This vulnerability was fixed in Firefox 136.
EPSS: 0.002 (7.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.9 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.
Affected products
- Mozilla Firefox — versions 136
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@mozilla.org (Issue Tracking)
- security@mozilla.org (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Product)
Frequently asked questions
- What is CVE-2025-1939?
- CVE-2025-1939 is a low-severity vulnerability in Mozilla Firefox, classified under Exposure of Private Personal Information to an Unauthorized Actor. CVSS score: 3.9/10. Published 2025-03-04.
- How severe is CVE-2025-1939?
- Low severity. CVSS v3 base score is 3.9 out of 10.
- Is CVE-2025-1939 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.