FirefoxWeb browser · Mozilla
CVE-2026-6756
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 · uneditedMitigation bypass in Firefox for Android. This vulnerability was fixed in Firefox 150.
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 mitigation bypass vulnerability in Firefox for Android that allowed circumvention of a security control. The issue was addressed in Firefox version 150.
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
< 150.0CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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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Confirm Firefox for Android is installedCheck if the app package 'org.mozilla.firefox' exists on the device using 'adb shell pm list packages | grep mozilla' or by checking Settings > Apps on the deviceAffected if The app package is not present, meaning Firefox for Android is not installed and this CVE does not apply
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Identify the installed Firefox for Android versionRun 'adb shell dumpsys package org.mozilla.firefox' and locate the 'versionName' field in the output, or check Settings > Apps > Firefox > Version on the deviceAffected if The version shown is below 150.0 (for example, 149.x, 148.x, etc.)
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Verify the specific security control contextReview any custom security configurations, add-ons, or enterprise policies enabled in Firefox for Android that might relate to the mitigation being bypassed. Check about:config in the browser for any non-default security-related preferencesAffected if A non-default security control is enabled AND the Firefox version is below 150.0, indicating the mitigation bypass could be exploited
The environment is affected if Firefox for Android is installed with a version number lower than 150.0, since this is the version where the mitigation bypass vulnerability was addressed.
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 · scoped150.0
Update Firefox for Android to version 150 or later to remediate this vulnerability.
Firefox 150.0
- Open Google Play Store on your Android device
- Search for Firefox or Firefox for Android
- If an update is available, tap Update to install Firefox 150.0 or later
- Alternatively, enable auto-updates in Firefox settings to receive future security updates automatically
- After updating, verify the version by navigating to Firefox > Settings > About Firefox
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-2026-6756 — 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-2026-6756 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
- No spam, self-promotion, credentials, or personal data