dbcve.org
FirefoxWeb browser · Mozilla

CVE-2024-0747

MEDIUM · 6.5 CVSS v3.1 Published 2024-01-23
Fix available
A fix is available. Upgrade to 115.7 / 122.0 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
When a parent page loaded a child in an iframe with `unsafe-inline`, the parent Content Security Policy could have overridden the child Content Security Policy. This vulnerability affects Firefox < 122, Firefox ESR < 115.7, and Thunderbird < 115.7.

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

When a parent page loads a child in an iframe with the `unsafe-inline` directive, the parent's Content Security Policy incorrectly overrides the child's CSP, breaking the security isolation between the parent and child contexts and allowing potential script injection attacks.

MitigationUpdate affected browsers to Firefox 122+, Firefox ESR 115.7+, or Thunderbird 115.7+ to apply the vendor patch.

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:< 122.0
Firefox EsrWeb browser
Affected:< 115.7
Debian LinuxOperating system
Affected:= 10.0
ThunderbirdApplication
Affected:< 115.7

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 installed Firefox version
    Navigate to Firefox menu > Help > About Firefox, or enter 'about:support' in the address bar, to view the installed version number
    Affected if Version is below 122.0 (e.g., 121.x, 120.x, etc.)
  2. Check installed Firefox ESR version
    Navigate to Firefox ESR menu > Help > About Firefox ESR, or enter 'about:support' in the address bar, to view the installed ESR version number
    Affected if Version is below 115.7 (e.g., 115.6, 115.0, etc.)
  3. Check installed Thunderbird version
    Navigate to Thunderbird menu > Help > About Thunderbird, or enter 'about:support' in the address bar, to view the installed version number
    Affected if Version is below 115.7 (e.g., 115.6, 115.0, etc.)
  4. Identify iframe usage with CSP unsafe-inline
    Review web application code or browser console for pages that load iframes while setting Content-Security-Policy headers that include the 'unsafe-inline' directive
    Affected if Parent pages load iframe content AND apply CSP headers containing 'unsafe-inline' directive

You are affected if running Firefox < 122.0, Firefox ESR < 115.7, or Thunderbird < 115.7 AND your application loads iframes while enforcing a CSP with the unsafe-inline directive.

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 115.7 / 122.0 or later
Fixed in 115.7122.0
Interim mitigation

Update affected browsers to Firefox 122+, Firefox ESR 115.7+, or Thunderbird 115.7+ to apply the vendor patch.

Recommended fix High confidence

Firefox 122.0 (or Firefox ESR 115.7), Thunderbird 115.7

  1. Check current Firefox version by navigating to about:firefox or running 'firefox --version'
  2. Check current Thunderbird version by navigating to about:thunderbird or running 'thunderbird --version'
  3. For Firefox: Update to version 122.0 or later via the application's built-in update mechanism (Help > About Firefox > Check for Updates)
  4. For Firefox ESR: Update to version 115.7 or later
  5. For Thunderbird: Update to version 115.7 or later
  6. Restart the application after updating
  7. Verify the update was successful by checking the version again
Caveat Mozilla releases typically have minimal breaking changes; however, some older extensions or themes may be incompatible with major version updates. Ensure extension compatibility before upgrading in enterprise environments.

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

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
3.0 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-2024-0747 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