dbcve.org
FirefoxWeb browser · Mozilla

CVE-2023-28164

MEDIUM · 6.5 CVSS v3.1 Published 2023-06-02
Fix available
A fix is available. Upgrade to 102.9 / 111.0 or later.
See remediation →
72/100
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
Dragging a URL from a cross-origin iframe that was removed during the drag could have led to user confusion and website spoofing attacks. This vulnerability affects Firefox < 111, Firefox ESR < 102.9, and Thunderbird < 102.9.

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 and Thunderbird allows a cross-origin iframe to be removed during a drag operation, causing the browser to display the wrong URL in the drag preview. This can mislead users about the actual destination of a link, enabling spoofing attacks where users believe they're dragging a legitimate URL but are actually dragging a malicious one.

MitigationUpdate Firefox to version 111 or later, Firefox ESR to 102.9 or later, and Thunderbird to 102.9 or later. For organizations, deploy the browser updates via standard software distribution channels.

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:< 111.0
Firefox EsrWeb browser
Affected:< 102.9
ThunderbirdApplication
Affected:< 102.9

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

CVSS:3.1/AV:N/AC:L/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 installed Mozilla browser or mail client
    Check for installed Firefox or Thunderbird instances on the system. On Windows, look in Program Files/Mozilla Firefox or Program Files/Mozilla Thunderbird. On macOS, check /Applications/Firefox.app or /Applications/Thunderbird.app. On Linux, use package manager (dpkg -l | grep firefox or rpm -qa | grep thunderbird)
    Affected if No Firefox or Thunderbird is installed, the check does not apply. Continue only if either product is present.
  2. Check Firefox version (Standard edition)
    In Firefox, go to Help > About Firefox, or navigate to about:support in the address bar. The version number is displayed at the top. Alternatively, check the executable file properties on Windows or use 'firefox --version' on command line.
    Affected if Installed version is below 111.0 (for example, 110.0, 109.0, etc.)
  3. Check Firefox ESR version
    In Firefox ESR, go to Help > About Firefox, or navigate to about:support in the address bar. The version will display as 'Firefox ESR XX.X' where XX.X is the release number. Alternatively, check the executable file properties or use 'firefox --version' on command line.
    Affected if Installed version is below 102.9 (for example, 102.8, 102.7, etc.)
  4. Check Thunderbird version
    In Thunderbird, go to Help > About Thunderbird, or navigate to about:support in the address bar. The version number is displayed at the top. Alternatively, check the executable file properties on Windows or use 'thunderbird --version' on command line.
    Affected if Installed version is below 102.9 (for example, 102.8, 102.7, etc.)

A user is affected if any installed Firefox (standard or ESR) or Thunderbird version falls below the respective threshold (111.0 for Firefox standard, 102.9 for Firefox ESR and Thunderbird).

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 102.9 / 111.0 or later
Fixed in 102.9111.0
Interim mitigation

Update Firefox to version 111 or later, Firefox ESR to 102.9 or later, and Thunderbird to 102.9 or later. For organizations, deploy the browser updates via standard software distribution channels.

Recommended fix High confidence

Firefox 111.0+ / Firefox ESR 102.9+ / Thunderbird 102.9+

  1. 1. Open Firefox and click the menu button (three horizontal lines) in the top right corner
  2. 2. Click 'Help' and then select 'About Firefox'
  3. 3. The About Firefox window will automatically check for updates and download them if available
  4. 4. If an update is available, click 'Restart to update Firefox' to complete the installation
  5. 5. After restarting, verify the version by going to Help > About Firefox - it should show 111.0 or higher for standard Firefox, or 102.9 or higher for Firefox ESR
  6. 6. For Thunderbird, use Help > About Thunderbird and follow the same update process

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

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $890
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,424.

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-2023-28164 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

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