dbcve.org
FirefoxWeb browser · Mozilla

CVE-2019-9817

MEDIUM · 5.3 CVSS v3.0 Published 2019-07-23
Fix available
A fix is available. Upgrade to 60.7 / 67.0 or later.
See remediation →
62/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

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
Images from a different domain can be read using a canvas object in some circumstances. This could be used to steal image data from a different site in violation of same-origin policy. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.

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

This is a Same-Origin Policy bypass vulnerability where the HTML5 canvas API can be exploited to read image data from a different domain, allowing attackers to steal image content from other websites in violation of browser security models.

MitigationUpgrade affected software to Firefox 67+, Firefox ESR 60.7+, or Thunderbird 60.7+ to obtain the patched version.

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:< 67.0
Firefox EsrWeb browser
Affected:< 60.7
ThunderbirdApplication
Affected:< 60.7

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
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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 product
    Check if Firefox or Thunderbird is installed. On Windows, look in Program Files. On macOS, check /Applications. On Linux, run which firefox or which thunderbird.
    Affected if Either Firefox or Thunderbird is present on the system
  2. Determine Firefox version
    For Firefox: Open menu > Help > About Firefox, or run firefox --version in terminal, or check the executable properties.
    Affected if Firefox version is below 67.0 (or below 60.7 for ESR)
  3. Determine Thunderbird version
    For Thunderbird: Open menu > Help > About Thunderbird, or run thunderbird --version in terminal, or check the executable properties.
    Affected if Thunderbird version is below 60.7
  4. Check ESR status if Firefox
    If Firefox is installed, check if it is the Extended Support Release (ESR) variant by looking at the about dialog or running firefox --version - ESR versions include 'ESR' in the version string.
    Affected if Firefox ESR version is below 60.7

The user is affected if Firefox (any variant) below 67.0, Firefox ESR below 60.7, or Thunderbird below 60.7 is installed and used to view untrusted HTML content with embedded images.

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 60.7 / 67.0 or later
Fixed in 60.767.0
Interim mitigation

Upgrade affected software to Firefox 67+, Firefox ESR 60.7+, or Thunderbird 60.7+ to obtain the patched version.

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $910
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,456.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2019-9817 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

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-2019-9817 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

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