CVE-2025-3859

Firefox Focus elide URL allows address bar spoofing

Published: Apr 30, 2025Updated: Apr 13, 2026 Sources: CVE List NVDCWE-601

NVD MITRE

6.1CVSSMEDIUM

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 Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:NAvailability

None

Open in CVSS calculator →

Weaknesses

CWE-601 CWE-451

Affected Products

Focus Mozilla

On-premDesktop App

Consumer Software / browser

firefox focus mozilla

On-premMobile App

Consumer Software / browser

mozillaoss-projectUSConsumer Softwareaka mozilla corp.

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique

Initial Access

View detailed technique mapping

References

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

bugzilla.mozilla.org

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

mozilla.org

Timeline

Published

Apr 30, 2025

Last Updated

Apr 13, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2025-3859 and every CVE in our database. Create a free account — no credit card required.

Create Free Account

Plain-language analysis

Impact assessment and exploitation scenario in plain English

Attack graph visualization

Interactive attack path and kill chain mapping

Exploit details & PoC links

ExploitDB, Metasploit, GitHub PoCs with direct links

Nuclei scanner templates

Ready-to-use vulnerability scanner templates

Full remediation guide

Patch instructions, workarounds, and compliance impact

Interactive AI chat

Ask questions about this vulnerability in natural language

Related vulnerabilities

Semantically similar CVEs and attack patterns

REST API & MCP access

Integrate vulnerability data into your workflows