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CVE-2025-3859— Firefox Focus elide URL allows address bar spoofing

Quick assessment

Affected
Mozilla Focus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla Firefox Focus是美国Mozilla基金会的一个供iOS设备专用的浏览器。 Mozilla Firefox Focus 138之前版本存在安全漏洞，该漏洞源于长URL截断行为，可能导致用户被误导至不同网页。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1553 · Subvert Trust Controls
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I. Basic Information for CVE-2025-3859

Vulnerability Information
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Vulnerability Title
Firefox Focus elide URL allows address bar spoofing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Firefox Focus 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox Focus是美国Mozilla基金会的一个供iOS设备专用的浏览器。 Mozilla Firefox Focus 138之前版本存在安全漏洞，该漏洞源于长URL截断行为，可能导致用户被误导至不同网页。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Focus 138 ~ * -

II. Public POCs for CVE-2025-3859

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III. Intelligence Information for CVE-2025-3859

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Vendor Advisories for CVE-2025-3859 (2)

IV. Related Vulnerabilities

Same vendor: Mozilla

V. Comments for CVE-2025-3859

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