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FirefoxWeb browser · Mozilla

CVE-2024-10461

MEDIUM · 6.1 CVSS v3.1 Published 2024-10-29
Fix available
A fix is available. Upgrade to 128.4.0 / 132.0 or later.
See remediation →
68/100
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
In multipart/x-mixed-replace responses, `Content-Disposition: attachment` in the response header was not respected and did not force a download, which could allow XSS attacks. This vulnerability affects Firefox < 132, Firefox ESR < 128.4, Thunderbird < 128.4, and Thunderbird < 132.

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

In multipart/x-mixed-replace responses (used for streaming/server-sent events), the `Content-Disposition: attachment` header was ignored, preventing forced downloads. This allowed the browser to render content inline rather than triggering a download, enabling XSS attacks when malicious content is served through this content type.

MitigationUpdate affected software to patched versions: Firefox >= 132, Firefox ESR >= 128.4, Thunderbird >= 128.4/132. Until patched, restrict exposure by avoiding untrusted multipart/x-mixed-replace content and implementing Content Security Policy headers.

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:< 128.4.0< 132.0
ThunderbirdApplication
Affected:< 128.4.0>= 129.0, < 132.0

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
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 product
    Check if Firefox or Thunderbird is installed by looking for the application in the system (e.g., about:support in Firefox, Help > About Thunderbird, or checking installed programs)
    Affected if Product is Mozilla Firefox or Thunderbird and version is vulnerable
  2. Check Firefox version number
    In Firefox, navigate to about:support or go to Menu > Help > About Firefox to see the exact version (e.g., 131.0.3, 128.3.0)
    Affected if Version is less than 128.4.0 or less than 132.0 (for versions 128.x, check if below 128.4.0; for versions 129-131.x, check if below 132.0)
  3. Check Thunderbird version number
    In Thunderbird, go to Help > About Thunderbird to see the exact version (e.g., 131.0.3, 128.3.0)
    Affected if Version is less than 128.4.0 OR version is 129.0 or higher but less than 132.0

A user is affected if they run Firefox below 128.4.0 or below 132.0 (for 128.x+ branches), or Thunderbird below 128.4.0 or between 129.0 and 131.x.

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 128.4.0 / 132.0 or later
Fixed in 128.4.0132.0
Interim mitigation

Update affected software to patched versions: Firefox >= 132, Firefox ESR >= 128.4, Thunderbird >= 128.4/132. Until patched, restrict exposure by avoiding untrusted multipart/x-mixed-replace content and implementing Content Security Policy headers.

Recommended fix High confidence

Firefox 132.0 / Firefox ESR 128.4.0 / Thunderbird 128.4.0 / Thunderbird 132.0 (depending on branch)

  1. 1. Check current Firefox or Thunderbird version by navigating to the application's 'About' menu (Help > About Firefox/Thunderbird)
  2. 2. If running Firefox < 132.0, upgrade to Firefox 132.0 or later
  3. 3. If running Firefox ESR < 128.4.0, upgrade to Firefox ESR 128.4.0 or later
  4. 4. If running Thunderbird < 128.4.0, upgrade to Thunderbird 128.4.0 or later
  5. 5. If running Thunderbird >= 129.0 and < 132.0, upgrade to Thunderbird 132.0 or later
  6. 6. After upgrade, restart the application to ensure the fix is fully applied
Caveat Users should back up profiles before major version upgrades; some add-ons may be incompatible with major version jumps

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
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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-2024-10461 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