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FirefoxWeb browser · Mozilla

CVE-2022-1529

HIGH · 8.8 CVSS v3.1 Published 2022-12-22
Fix available
A fix is available. Upgrade to 91.9.1 / 100.0.2 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
An attacker could have sent a message to the parent process where the contents were used to double-index into a JavaScript object, leading to prototype pollution and ultimately attacker-controlled JavaScript executing in the privileged parent process. This vulnerability affects Firefox ESR < 91.9.1, Firefox < 100.0.2, Firefox for Android < 100.3.0, and Thunderbird < 91.9.1.

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

This is a prototype pollution vulnerability in Firefox and Thunderbird where an attacker sends a message to a parent process with contents used to double-index into a JavaScript object. This double-indexing allows the attacker to modify the object's prototype, eventually enabling arbitrary JavaScript execution in a privileged parent process context.

MitigationUpdate to Firefox ESR 91.9.1+, Firefox 100.0.2+, Firefox for Android 100.3.0+, or Thunderbird 91.9.1+ to patch 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:< 100.0.2< 100.3.0
Firefox EsrWeb browser
Affected:< 91.9.1
ThunderbirdApplication
Affected:< 91.9.1

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. Identify installed Mozilla products
    Check for Firefox or Thunderbird executables in standard installation locations (e.g., C:\Program Files\Mozilla Firefox\firefox.exe on Windows, /Applications/Firefox.app on macOS, or /usr/lib/firefox on Linux). Also check package managers or software inventories.
    Affected if Firefox or Thunderbird is present on the system
  2. Determine Firefox version
    Run 'firefox --version' from command line, or open Firefox, go to Help > About Firefox to view the version number.
    Affected if Version is below 100.0.2 or below 100.3.0 (depending on the specific Firefox channel)
  3. Determine Firefox ESR version
    Run 'firefox --version' from command line, or open Firefox ESR, go to Help > About Mozilla Firefox to view the version number.
    Affected if Version is below 91.9.1
  4. Determine Thunderbird version
    Run 'thunderbird --version' from command line, or open Thunderbird, go to Help > About Thunderbird to view the version number.
    Affected if Version is below 91.9.1

A user is affected if they have Firefox (any channel) below 100.0.2 or 100.3.0, Firefox ESR below 91.9.1, or Thunderbird below 91.9.1 installed on their system.

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 91.9.1 / 100.0.2 / 100.3.0 or later
Fixed in 91.9.1100.0.2100.3.0
Interim mitigation

Update to Firefox ESR 91.9.1+, Firefox 100.0.2+, Firefox for Android 100.3.0+, or Thunderbird 91.9.1+ to patch this vulnerability.

Recommended fix High confidence

Firefox 100.0.2/100.3.0, Firefox ESR 91.9.1, or Thunderbird 91.9.1

  1. 1. Check the currently installed version of Firefox, Firefox ESR, or Thunderbird
  2. 2. Download the appropriate fixed version from the official Mozilla website (www.mozilla.org)
  3. 3. For Firefox: Upgrade to version 100.0.2 (desktop) or 100.3.0 (Android)
  4. 4. For Firefox ESR: Upgrade to version 91.9.1
  5. 5. For Thunderbird: Upgrade to version 91.9.1
  6. 6. Restart the application after upgrading
  7. 7. Verify the installed version matches the fixed release
Caveat Minor release upgrades typically have no breaking changes; however, always review release notes for add-on compatibility and settings migration

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

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,060
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,696.

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-2022-1529 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