dbcve.org
FirefoxWeb browser · Mozilla

CVE-2024-9392

CRITICAL · 9.8 CVSS v3.1 Published 2024-10-01
Fix available
A fix is available. Upgrade to 115.6.0 / 128.3.0 or later.
See remediation →
100/100
Remediation priority · Urgent
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 compromised content process could have allowed for the arbitrary loading of cross-origin pages. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Firefox ESR < 115.16, Thunderbird < 128.3, and Thunderbird < 131.

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 compromised content process in Firefox and Thunderbird could bypass cross-origin security restrictions, allowing arbitrary loading of pages from different origins. This represents a critical same-origin policy bypass where a compromised renderer process gains unauthorized cross-origin access capabilities.

MitigationUpgrade to Firefox 131 or later, Firefox ESR 128.3/115.16 or later, or Thunderbird 128.3/131 or later to remediate this vulnerability.

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:< 115.6.0< 131.0
ThunderbirdApplication
Affected:< 128.3.0>= 129.0, < 131.0

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
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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. Check installed Firefox version
    Navigate to Menu > Help > About Firefox, or enter 'about:support' in the address bar, or run 'firefox --version' from command line
    Affected if The displayed version is earlier than 115.6.0, or falls between 115.6.0 and 130.x inclusive (any version < 131.0)
  2. Check installed Thunderbird version
    Navigate to Menu > Help > About Thunderbird, or run 'thunderbird --version' from command line
    Affected if The displayed version is earlier than 128.3.0, or falls between 129.0 and 130.x inclusive (any version < 131.0)
  3. Confirm content process is in use
    Enter 'about:support' in the Firefox or Thunderbird address bar and look for 'Multiprocess Windows' or 'Content Process' status
    Affected if Multiprocess Windows is enabled - all modern Firefox and Thunderbird installations use the content process architecture by default, making them vulnerable if the version is in the affected range

A user is affected if they are running Firefox versions prior to 115.6.0 or between 115.6.0 and 130.x, or Thunderbird versions prior to 128.3.0 or between 129.0 and 130.x, with multiprocess content enabled (the default configuration).

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 115.6.0 / 128.3.0 / 131.0 or later
Fixed in 115.6.0128.3.0131.0
Interim mitigation

Upgrade to Firefox 131 or later, Firefox ESR 128.3/115.16 or later, or Thunderbird 128.3/131 or later to remediate this vulnerability.

Recommended fix High confidence

Firefox 131.0 (regular), Firefox ESR 128.3, Firefox ESR 115.16, Thunderbird 131.0, or Thunderbird 128.3 depending on which branch you are on

  1. Check current Firefox version by navigating to menu > Help > About Firefox
  2. Check current Thunderbird version by navigating to menu > Help > About Thunderbird
  3. For Firefox < 115.6.0: upgrade to Firefox ESR 115.16 or later
  4. For Firefox >= 115.6.0 and < 131.0: upgrade to Firefox 131.0 or later
  5. For Firefox ESR >= 115.6.0 and < 128.3: upgrade to Firefox ESR 128.3 or later
  6. For Thunderbird < 128.3.0: upgrade to Thunderbird 128.3.0 or later
  7. For Thunderbird >= 129.0 and < 131.0: upgrade to Thunderbird 131.0 or later
  8. Restart the application after upgrade
Caveat Standard Mozilla release upgrades typically preserve settings and extensions; minor compatibility issues may arise with older extensions

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

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.

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-2024-9392 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