dbcve.org
FirefoxWeb browser · Mozilla

CVE-2022-36318

MEDIUM · 5.3 CVSS v3.1 Published 2022-12-22
Fix available
A fix is available. Upgrade to 91.12 / 102.1 or later.
See remediation →
60/100
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 visiting directory listings for `chrome://` URLs as source text, some parameters were reflected. This vulnerability affects Firefox ESR < 102.1, Firefox ESR < 91.12, Firefox < 103, Thunderbird < 102.1, and Thunderbird < 91.12.

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 · moderate confidence

A reflected parameter vulnerability exists in Firefox and Thunderbird where directory listings for chrome:// URLs reflect some parameters without proper sanitization. This could allow an attacker to inject malicious content via crafted URLs with parameters, potentially leading to information disclosure or further client-side attacks.

MitigationUpdate affected installations to Firefox ESR 102.1+, Firefox 103+, Thunderbird 102.1+, or Thunderbird 91.12+. Organizations should inventory and patch all vulnerable browser and email client installations.

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:< 103.0
Firefox EsrWeb browser
Affected:< 102.1< 91.12
ThunderbirdApplication
Affected:< 102.1< 91.12

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
High
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/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 Firefox version on the system
    Open Firefox, navigate to Help > About Firefox (or go to about:support) to view the version number. Alternatively, check the installed package via system package manager or locate firefox executable and query its version.
    Affected if The installed version is less than 103.0 (for standard Firefox) or less than 102.1 / 91.12 (for ESR versions)
  2. Check Thunderbird version on the system
    Open Thunderbird, navigate to Help > About Thunderbird to view the version number. Alternatively, check via system package manager.
    Affected if The installed version is less than 102.1 or less than 91.12 (for older branch)
  3. Verify if chrome:// URL handling is accessible
    In Firefox or Thunderbird, try accessing a chrome:// URL such as chrome://browser/content/browser.xul or chrome://mozapps/content/extensions/about.xhtml in the address bar to confirm the browser can process these URLs.
    Affected if The browser successfully loads chrome:// resources, indicating the attack surface exists (this feature is standard in vulnerable versions)
  4. Identify all installed browser and email client instances
    Inventory the system for any Firefox or Thunderbird installations, including multiple versions, portable versions, or instances in non-standard directories.
    Affected if Any Firefox or Thunderbird installation found with a version matching the affected ranges

A user is affected if any installed Firefox version is below 103.0 (standard) or below 102.1/91.12 (ESR), or any Thunderbird version is below 102.1/91.12, and the browser can access chrome:// URL resources.

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 91.12 / 102.1 / 103.0 or later
Fixed in 91.12102.1103.0
Interim mitigation

Update affected installations to Firefox ESR 102.1+, Firefox 103+, Thunderbird 102.1+, or Thunderbird 91.12+. Organizations should inventory and patch all vulnerable browser and email client installations.

Recommended fix High confidence

Firefox 103.0+ | Firefox ESR 102.1+ or 91.12+ | Thunderbird 102.1+ or 91.12+

  1. 1. Identify the installed Mozilla product (Firefox, Firefox ESR, or Thunderbird) and its current version
  2. 2. For Firefox: upgrade to version 103.0 or later
  3. 3. For Firefox ESR: upgrade to version 102.1 or later, or version 91.12 or later
  4. 4. For Thunderbird: upgrade to version 102.1 or later, or version 91.12 or later
  5. 5. Verify the update was successful by checking the application's version information
Caveat Standard minor version upgrades typically preserve settings and profiles; ensure compatible extensions/themes before updating

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-2022-36318 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