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FirefoxWeb browser · Mozilla

CVE-2023-23601

MEDIUM · 6.5 CVSS v3.1 Published 2023-06-02
Fix available
A fix is available. Upgrade to 102.7 / 109.0 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
Navigations were being allowed when dragging a URL from a cross-origin iframe into the same tab which could lead to website spoofing attacks This vulnerability affects Firefox < 109, Firefox ESR < 102.7, and Thunderbird < 102.7.

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

Firefox and Thunderbird allowed navigation to occur when a URL was dragged from a cross-origin iframe and dropped in the same tab. This enabled an attacker within the iframe to trigger navigation to an arbitrary URL, facilitating website spoofing attacks where the victim believes they're still on the original page.

MitigationUpdate Firefox to version 109 or later, Firefox ESR to 102.7 or later, and Thunderbird to 102.7 or later to obtain the patched version.

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:< 109.0
Firefox EsrWeb browser
Affected:< 102.7
ThunderbirdApplication
Affected:< 102.7

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. Check Firefox version
    Open Firefox, click the menu (three lines) > Help > About Firefox, or navigate to about:support. Note the version number shown.
    Affected if Version is below 109.0, or version is below 102.7 and contains 'ESR' in the version string
  2. Check Thunderbird version
    Open Thunderbird, click the menu (three lines) > Help > About Thunderbird. Note the version number shown.
    Affected if Version is below 102.7
  3. Identify if Firefox is Standard or ESR release
    In the About Firefox window, look for 'ESR' in the version string (for example, '102.6 ESR'). If 'ESR' is present, this is an Extended Support Release.
    Affected if The version contains 'ESR' and is below 102.7, or does not contain 'ESR' and is below 109.0
  4. Confirm cross-origin iframe usage (optional context)
    This vulnerability involves dragging a URL from a cross-origin iframe. To test if the environment has iframes, inspect page source or use browser developer tools to check for iframe elements from different domains.
    Affected if A cross-origin iframe exists and the browser version is vulnerable (not yet patched)

The user is affected if their installed Firefox version is below 109.0 (standard) or below 102.7 (ESR), or if Thunderbird is below 102.7.

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 102.7 / 109.0 or later
Fixed in 102.7109.0
Interim mitigation

Update Firefox to version 109 or later, Firefox ESR to 102.7 or later, and Thunderbird to 102.7 or later to obtain the patched version.

Recommended fix High confidence

Firefox 109.0, Firefox ESR 102.7, or Thunderbird 102.7

  1. Open Firefox/Thunderbird and navigate to Help > About Firefox/Thunderbird
  2. In the About window, click 'Check for Updates' or allow the automatic check to complete
  3. If an update is available, click 'Update to [version]' to download and install it
  4. Restart the application to complete the installation
  5. Alternatively, download the latest version from https://www.mozilla.org/firefox/ or https://www.mozilla.org/thunderbird/ and reinstall
Caveat Standard Mozilla release updates typically have minimal breaking changes; however, some older extensions or configurations may need review after major version upgrades

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

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
4.0 hours of engineering $750
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.

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-2023-23601 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