Medium severity · published Apr 30, 2025
CVE-2025-3859
Websites directing users to long URLs that caused eliding to occur in the location view could leverage the truncating behavior to potentially trick users into thinking they were…
6.1
CVSS
0.2%
EPSS
No
On KEV
Description
Websites directing users to long URLs that caused eliding to occur in the location view could leverage the truncating behavior to potentially trick users into thinking they were on a different webpage. This vulnerability was fixed in Focus 138.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 10% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FF
Firefox Focus · Mozilla
before 138.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-3859
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-3859
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1951533
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-33/
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