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FirefoxWeb browser · Mozilla

CVE-2018-18499

MEDIUM · 6.5 CVSS v3.0 Published 2019-02-28
Fix available
A fix is available. Upgrade to 60.2 / 60.2.1 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
A same-origin policy violation allowing the theft of cross-origin URL entries when using a meta http-equiv="refresh" on a page to cause a redirection to another site using performance.getEntries(). This is a same-origin policy violation and could allow for data theft. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.

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

Same-origin policy bypass in Firefox, Firefox ESR, and Thunderbird allowing theft of cross-origin URL entries via meta http-equiv='refresh' redirects combined with the performance.getEntries() API, which improperly exposes navigation timing data to cross-origin contexts.

MitigationUpdate vulnerable browser installations to Firefox 62+, Firefox ESR 60.2+, or Thunderbird 60.2.1+ to patch the same-origin policy violation in the Performance API.

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:< 62.0
Firefox EsrWeb browser
Affected:< 60.2
ThunderbirdApplication
Affected:< 60.2.1

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
None
Availability
None

CVSS:3.0/AV:N/AC:L/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. Identify installed Mozilla browser product
    Determine if Firefox, Firefox ESR, or Thunderbird is installed on the system
    Affected if Any of these three Mozilla products is present
  2. Check Firefox version
    Open Firefox, click Help > About Firefox, or run 'firefox --version' from command line
    Affected if Version is below 62.0 (e.g., 61.x, 60.x, etc.)
  3. Check Firefox ESR version
    Open Firefox ESR, click Help > About Firefox ESR, or run 'firefox-esr --version' from command line
    Affected if Version is below 60.2 (e.g., 60.1, 60.0, etc.)
  4. Check Thunderbird version
    Open Thunderbird, click Help > About Thunderbird, or run 'thunderbird --version' from command line
    Affected if Version is below 60.2.1 (e.g., 60.2, 60.1, etc.)

The environment is affected if any installed Mozilla browser (Firefox, Firefox ESR, or Thunderbird) has a version lower than the safe thresholds (62.0, 60.2, or 60.2.1 respectively).

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.

From vendor data
Upgrade available Upgrade to 60.2 / 60.2.1 / 62.0 or later
Fixed in 60.260.2.162.0
Interim mitigation

Update vulnerable browser installations to Firefox 62+, Firefox ESR 60.2+, or Thunderbird 60.2.1+ to patch the same-origin policy violation in the Performance API.

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $890
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,424.

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-2018-18499 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