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FirefoxWeb browser · Mozilla

CVE-2016-5267

MEDIUM · 5.3 CVSS v3.0 Published 2016-08-05
Fix available
A fix is available. Upgrade to after 47.0.1 or later.
See remediation →
60/100
Remediation priority · Elevated
Remotely reachable No privileges

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 · unedited
Mozilla Firefox before 48.0 on Android allows remote attackers to spoof the address bar via left-to-right characters in conjunction with a right-to-left character set.

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 · high confidence

Firefox for Android before 48.0 contains an address bar spoofing vulnerability where attackers can exploit Unicode rendering behavior. By inserting left-to-right characters (like space or numbers) before a right-to-left string (e.g., Arabic/Hebrew), the URL displayed in the address bar can be manipulated to show a trusted domain while the actual navigation goes to a malicious site.

MitigationUpgrade Firefox for Android to version 48.0 or later. Users should be instructed to update their browser through the Google Play Store.

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
Affected:<= 47.0.1

CVSS 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
High
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.0/AV:N/AC:H/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify if Firefox for Android is installed
    Check the device for the Firefox browser app. On Android, this is typically listed in Settings > Apps as 'Firefox' (the icon is a fox globe). Do NOT confuse with Firefox Focus or Firefox Preview.
    Affected if Firefox for Android app is present on the device
  2. Determine the installed Firefox for Android version
    Open Google Play Store, search for 'Firefox', tap on the app, and scroll to view the version number under 'Version'. Alternatively, go to Settings > Apps > Firefox > App info to see the version.
    Affected if The displayed version is 47.0.1 or any version lower than 47.0.1
  3. Confirm the browser is actively used or accessible
    Check if the Firefox for Android app has been launched or if it remains installed with an active profile. This vulnerability requires the address bar to be used for navigation.
    Affected if Firefox for Android version 47.0.1 or lower is installed and the browser has been used or could be used for web navigation

A user is affected if Firefox for Android version 47.0.1 or earlier is installed on their device and the browser is accessible for navigation.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

From vendor data
Upgrade available Upgrade to a release after 47.0.1
Interim mitigation

Upgrade Firefox for Android to version 48.0 or later. Users should be instructed to update their browser through the Google Play Store.

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
3.0 hours of engineering $750
Get the upgrade done

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

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2016-5267 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data