TI-2025-03408 Aliases CVE-2025-3859 GHSA-4jh7-c2vv-7qf2

Firefox Focus elide URL allows address bar spoofing

LOW 27CWE-451Published 2025-04-30 · Updated 2026-04-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Spoofing
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-451.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00208 10th percentileScored 2026-11-07

Fix Fixed Focus (Mozilla): 138

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Mozilla	Focus	—	138	Patch available	CNA

Focus VendorMozilla Affected — Fixed in 138 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox_focus::::::iphone_os::*	before 138.0	Vulnerable	Mozilla

cpe:2.3:a:mozilla:firefox_focus:*:*:*:*:*:iphone_os:*:* Versions before 138.0 Vulnerable ·Mozilla

Remediation

Fix · CNA Focus (Mozilla) Fixed in 138

Timeline

2026-10-02 Threatist record created from CVE-2025-3859
2026-10-03 Alias added: GHSA-4jh7-c2vv-7qf2

References

Advisory 1

https://www.mozilla.org/security/advisories/mfsa2025-33/

Other 1

https://bugzilla.mozilla.org/show_bug.cgi?id=1951533

TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
TI-2022-09831 Use after free in Mozilla Firefox KEVCVSS 3.1HIGH 8.8
TI-2023-11015 Authentication bypass by spoofing in Mozilla Firefox CVSS 3.1HIGH 7.5
TI-2025-34723 Passkey phishing within Bluetooth range CVSS 3.1CRITICAL 9.8
TI-2023-13902 Different techniques existed to obscure the fullscreen notification in Firefox and Focus… CVSS 3.1CRITICAL 9.1
TI-2024-09702 Improper authentication in Mozilla Focus for iOS CVSS 3.1CRITICAL 9.1

See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences