Firefox FocusWeb browser · Mozilla
CVE-2025-55033
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 · uneditedDragging JavaScript links to the URL bar in Focus for iOS could be utilized to run malicious scripts, potentially resulting in XSS attacks. This vulnerability was fixed in Focus for iOS 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 confidenceCross-site scripting (XSS) vulnerability in Focus for iOS allows malicious JavaScript to execute when users drag JavaScript links to the URL bar, enabling attackers to run arbitrary scripts in the context of the application's browsing context.
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
Firefox FocusWeb 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
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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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Locate the installed Firefox Focus versionOpen the App Store app, search for 'Firefox Focus', or go to your installed apps list. Tap on Firefox Focus to view its app details page where the version number is displayed under the app name.Affected if The version shown is below 142.0 (for example, 141.x, 140.x, etc.)
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Confirm version via iOS SettingsOpen Firefox Focus app, tap the menu icon (usually three lines or 'Aa'), scroll down and tap 'Settings', then tap 'About' to see the exact version number and build.Affected if The version displayed is less than 142.0
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Identify if the vulnerable behavior appliesThis vulnerability exploits the action of dragging JavaScript links (links with 'javascript:' scheme) into the URL bar. Consider whether you or your users have workflows that involve dragging links from external sources into the browser URL bar.Affected if You use Firefox Focus for iOS with a version below 142.0 AND routinely drag links from untrusted sources into the URL bar
You are affected if Firefox Focus for iOS version is below 142.0 and you or your users engage in dragging external links into the URL bar, as this enables the XSS attack vector.
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
Update to Focus for iOS version 142 or later to apply the patched code; users should avoid dragging untrusted JavaScript links into the URL bar as a defense-in-depth measure until the update is applied.
Firefox Focus for iOS 142.0
- Open the App Store on your iOS device
- Search for Firefox Focus or locate it in your installed apps
- Update Firefox Focus to version 142.0 or later
- After updating, verify the version by going to Settings > Firefox Focus > Version to confirm you are on 142.0 or higher
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Firefox Focus
Scoped from the published advisory
- Consultation1.0 h
- Implementation1.0 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-2025-55033 — 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-2025-55033 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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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.
- 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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