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FirefoxWeb browser · Mozilla

CVE-2024-8382

HIGH · 8.8 CVSS v3.1 Published 2024-09-03
Fix available
A fix is available. Upgrade to 115.15 / 128.2 or later.
See remediation →
95/100
Remediation priority · Urgent
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
Internal browser event interfaces were exposed to web content when privileged EventHandler listener callbacks ran for those events. Web content that tried to use those interfaces would not be able to use them with elevated privileges, but their presence would indicate certain browser features had been used, such as when a user opened the Dev Tools console. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, Firefox ESR < 115.15, Thunderbird < 128.2, and Thunderbird < 115.15.

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 vulnerability in Firefox and Thunderbird allowed internal browser event handler interfaces to be exposed to web content when privileged EventHandler listener callbacks executed. This exposure enables web content to detect when users have activated privileged browser features like the DevTools console, representing an information disclosure vulnerability but without granting elevated privileges to the web content.

MitigationUpdate affected installations to Firefox 130, Firefox ESR 128.2/115.15, or Thunderbird 128.2/115.15 as appropriate for the product in use.

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:< 130.0
Firefox EsrWeb browser
Affected:< 115.15>= 128.0, < 128.2

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
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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. Confirm Firefox or Thunderbird is installed
    Check for the presence of Firefox or Thunderbird executables or application files on the system. On Windows, look in Program Files. On macOS, check /Applications. On Linux, check common paths like /usr/bin/firefox or use package manager queries.
    Affected if Either Firefox or Thunderbird is present on the system
  2. Identify installed Firefox version
    For Firefox, navigate to Help > About Firefox, or check the application file properties, or run: firefox --version (Linux) or inspect application metadata files.
    Affected if The version number is less than 130.0 for standard Firefox, or falls between 128.0 (inclusive) and 128.2 (exclusive)
  3. Identify installed Firefox ESR version
    For Firefox ESR, check Help > About Firefox or inspect application metadata. ESR versions are typically labeled as such in the application information.
    Affected if The version is less than 115.15 for ESR branches below 128, or between 128.0 (inclusive) and 128.2 (exclusive) for ESR 128.x
  4. Identify installed Thunderbird version
    For Thunderbird, navigate to Help > About Thunderbird, or check application file properties, or run: thunderbird --version (Linux).
    Affected if The version is less than 115.15 or falls between 128.0 (inclusive) and 128.2 (exclusive)
  5. Understand the exposure mechanism
    This vulnerability is inherent to the browser code itself when handling EventHandler callbacks. There is no specific configuration file or toggle to check. The exposure manifests when web content can detect internal browser event interfaces during sensitive feature activation like DevTools.
    Affected if The browser version falls within any of the affected ranges listed above

A user is affected if they have any version of Firefox below 130.0, Firefox ESR below 115.15 or between 128.0 and 128.2, or Thunderbird below 115.15 or between 128.0 and 128.2.

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 115.15 / 128.2 / 130.0 or later
Fixed in 115.15128.2130.0
Interim mitigation

Update affected installations to Firefox 130, Firefox ESR 128.2/115.15, or Thunderbird 128.2/115.15 as appropriate for the product in use.

Recommended fix High confidence

Firefox 130.0 / Firefox ESR 115.15 / Firefox ESR 128.2 (depending on branch)

  1. 1. Identify which Firefox product and version is currently installed (Firefox, Firefox ESR, or Thunderbird)
  2. 2. For Firefox users: Upgrade to Firefox 130.0 or later
  3. 3. For Firefox ESR 115.x users: Upgrade to Firefox ESR 115.15 or later
  4. 4. For Firefox ESR 128.x users: Upgrade to Firefox ESR 128.2 or later
  5. 5. For Thunderbird users: Upgrade to Thunderbird 128.2 or later or Thunderbird 115.15 or later (matching the same ESR branch pattern)
  6. 6. Restart the browser application after upgrading to ensure all components are updated
Caveat Standard major version upgrade - review release notes for any add-on compatibility changes or UI modifications

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
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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-2024-8382 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