dbcve.org
FirefoxWeb browser · Mozilla

CVE-2022-22746

MEDIUM · 5.9 CVSS v3.1 Published 2022-12-22
Fix available
A fix is available. Upgrade to 91.5 / 96.0 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

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
A race condition could have allowed bypassing the fullscreen notification which could have lead to a fullscreen window spoof being unnoticed.<br>*This bug only affects Firefox for Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.

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

A race condition in Firefox for Windows allows bypassing the fullscreen notification, enabling attackers to perform fullscreen window spoofing without the user noticing. This could trick users into interacting with malicious content disguised as legitimate fullscreen applications.

MitigationUpdate affected Firefox ESR to version 91.5+, Firefox to version 96+, or Thunderbird to version 91.5+. This is a client-side patch; no configuration changes are required.

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:< 96.0
Firefox EsrWeb browser
Affected:< 91.5
ThunderbirdApplication
Affected:< 91.5

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
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/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 checks

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

  1. Check installed Firefox version
    In Firefox, go to Help > About Firefox, or navigate to about:support. The version number is displayed at the top.
    Affected if The displayed version is less than 96.0 and the browser is running on Windows.
  2. Check installed Firefox ESR version
    In Firefox ESR, go to Help > About Firefox ESR, or navigate to about:support. The version number is displayed at the top.
    Affected if The displayed version is less than 91.5 and the browser is running on Windows.
  3. Check installed Thunderbird version
    In Thunderbird, go to Help > About Thunderbird, or navigate to about:support. The version number is displayed at the top.
    Affected if The displayed version is less than 91.5 and the application is running on Windows.
  4. Verify Windows platform
    Check the operating system by right-clicking This PC or My Computer > Properties, or run 'winver' in the Run dialog. This vulnerability only affects Windows.
    Affected if The system is NOT running Windows (the flaw is Windows-specific).

A user is affected if they are running Firefox < 96.0, Firefox ESR < 91.5, or Thunderbird < 91.5 on a Windows system.

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.

dbcve · scoped
Upgrade available Upgrade to 91.5 / 96.0 or later
Fixed in 91.596.0
Interim mitigation

Update affected Firefox ESR to version 91.5+, Firefox to version 96+, or Thunderbird to version 91.5+. This is a client-side patch; no configuration changes are required.

Recommended fix High confidence

Firefox 96.0, Firefox ESR 91.5, or Thunderbird 91.5

  1. 1. Verify the current installed version of Firefox, Firefox ESR, or Thunderbird on Windows by navigating to Help > About [Application Name]
  2. 2. If the installed version is below 96.0 (Firefox), 91.5 (Firefox ESR), or 91.5 (Thunderbird), initiate an update via Help > Check for Updates
  3. 3. Alternatively, download the latest stable release from the official Mozilla website: https://www.mozilla.org/
  4. 4. Restart the application after the update completes
  5. 5. Confirm the updated version meets or exceeds the fixed release (Firefox 96.0, Firefox ESR 91.5, or Thunderbird 91.5)

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.

Scan for this in your stack

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dbcve dependency scanner

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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-2022-22746 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