FirefoxWeb browser · Mozilla
CVE-2025-1940
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 · uneditedA select option could partially obscure the confirmation prompt shown before launching external apps. This could be used to trick a user in to launching an external app unexpectedly. *This issue only affects Android versions of Firefox.*. This vulnerability was fixed in Firefox 136.
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 confidenceA UI obscuring vulnerability in Firefox for Android allows a select HTML element to partially cover the external app launch confirmation dialog. By manipulating the select option positioning, attackers can hide parts of the confirmation prompt, tricking users into launching external applications they did not intend to open.
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
< 136.0CVSS 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
- High
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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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Identify the installed Firefox productCheck if Mozilla Firefox for Android is installed on the device. This vulnerability affects only the Android version, not desktop Firefox.Affected if The product is Firefox for Android specifically
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Check Firefox for Android version numberNavigate to Firefox for Android Settings > About Firefox. Locate the version number displayed.Affected if The version number is below 136.0 (for example, 135.3, 135.0, or earlier)
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Verify external app launch functionality is accessibleConfirm that web pages can trigger external app launch prompts via intent URLs or the select element behavior in Firefox for Android.Affected if External app launch dialogs can be triggered through web content in the browser
A user is affected if Firefox for Android is installed with a version lower than 136.0 and web pages can trigger external app launch confirmation dialogs that could be obscured by select elements.
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 · scoped136.0
Update Firefox for Android to version 136 or later. Users should verify the full confirmation prompt is visible before accepting external app launches.
Firefox 136.0 (Android)
- Open the Google Play Store on your Android device
- Search for "Firefox" or locate it in your installed apps
- Tap "Update" to update Firefox to version 136.0 or later
- After the update completes, verify the version by going to Firefox > Settings > About Firefox - it should show version 136.0 or higher
- Restart Firefox to ensure the update is fully applied
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Firefox
Scoped from the published advisory
- Consultation4.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,960.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-1940 — 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-2025-1940 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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