FirefoxWeb browser · Mozilla
CVE-2025-9186
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedSpoofing issue in the Address Bar component of Firefox Focus for Android. This vulnerability was fixed in Firefox 142.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA URL spoofing vulnerability existed in the Address Bar component of Firefox Focus for Android that could allow an attacker to display a misleading URL in the address bar while the user navigates to a different site. This is a client-side UI spoofing issue that was addressed in Firefox version 142.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
FirefoxWeb browser
< 142.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if Firefox Focus for Android is installedOpen the device Settings > Apps > search for 'Firefox Focus' or 'Firefox', or check the app drawer for the Firefox Focus icon. Confirm the app name is specifically 'Firefox Focus' for Android.Affected if The app 'Firefox Focus for Android' is present on the device.
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Locate the installed version numberGo to Settings > Apps > Firefox Focus > App info, or tap the three-dot menu in Firefox Focus and navigate to Help > About Firefox Focus. The version number is displayed (e.g., 141.1, 140.0.3).Affected if A version number is displayed that can be compared against the affected range.
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Compare version against affected rangeCheck if the installed version is any build number less than 142.0 (such as 141.x, 140.x, 139.x, etc.). Note that version 142.0 and later are not affected.Affected if The installed version is below 142.0 (e.g., 141.1, 140.0.3, 139.0).
A user is affected if Firefox Focus for Android is installed with a version number lower than 142.0, as the URL spoofing vulnerability in the Address Bar component exists in those versions.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped142.0
Users should update Firefox Focus for Android to version 142 or later to receive the security patch. Organizations should ensure mobile devices have automatic updates enabled or deploy the updated version through MDM.
Firefox 142.0 (or later) for Android
- Open the Google Play Store on your Android device
- Search for Firefox Focus (or Firefox browser if targeting the main browser)
- Tap the Update button to install version 142.0 or later
- Alternatively, go to Settings > Apps > Firefox Focus (or Firefox) > Check for updates
- After updating, verify the version by opening the app, tapping the menu, selecting Help or About, and confirming the version number is 142.0 or higher
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Firefox
Scoped from the published advisory
- Consultation1.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-9186 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-9186 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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