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FirefoxWeb browser · Mozilla

CVE-2019-11742

MEDIUM · 6.5 CVSS v3.1 Published 2019-09-27
Fix available
A fix is available. Upgrade to 60.9.0 / 68.1.0 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 occurs allowing the theft of cross-origin images through a combination of SVG filters and a &lt;canvas&gt; element due to an error in how same-origin policy is applied to cached image content. The resulting same-origin policy violation could allow for data theft. This vulnerability affects Firefox < 69, Thunderbird < 68.1, Thunderbird < 60.9, Firefox ESR < 60.9, and Firefox ESR < 68.1.

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

A same-origin policy bypass vulnerability in Firefox and Thunderbird allows theft of cross-origin images by exploiting SVG filters in combination with a canvas element. The flaw stems from improper enforcement of same-origin policy on cached image content, enabling attackers to extract sensitive image data from other domains.

MitigationUpdate affected products to patched versions: Firefox 69+, Thunderbird 68.1+ or 60.9+, Firefox ESR 60.9+ or 68.1+. Organizations should deploy browser updates via their patch management systems.

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:< 60.9.0< 69.0
Firefox EsrWeb browser
Affected:>= 68.0, < 68.1.0
ThunderbirdApplication
Affected:< 60.9.0>= 68.0, < 68.1.0

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
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/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 installed Firefox version on Windows
    Open Firefox, click the menu button (three horizontal lines), select Help, then About Firefox. The version number is displayed in the dialog that opens.
    Affected if The version shown is earlier than 60.9.0, or is 60.9.0 through 68.0.x, or is 68.0 (ESR)
  2. Check installed Firefox version via command line on Windows
    Navigate to the Firefox installation directory (typically C:\Program Files\Mozilla Firefox\) and run: firefox.exe -v
    Affected if The reported version is earlier than 60.9.0, or is 60.9.0 through 68.0.x, or is 68.0 (ESR)
  3. Check installed Thunderbird version on Windows
    Open Thunderbird, click the menu button, select Help, then About Thunderbird. Note the version displayed.
    Affected if The version shown is earlier than 60.9.0, or is 68.0.x through 68.0.x (specifically 68.0 without the 68.1.0 patch)
  4. Check installed version on macOS
    For Firefox: open /Applications/Firefox.app and select Firefox > About Firefox. For Thunderbird: open /Applications/Thunderbird.app and select Thunderbird > About Thunderbird.
    Affected if The displayed version is earlier than 60.9.0, or falls between 60.9.0 and 68.0 (for Firefox non-ESR), or is exactly 68.0 (for ESR/Thunderbird)
  5. Check installed version on Linux
    Run: firefox --version or thunderbird --version from terminal
    Affected if The version output is earlier than 60.9.0, or is any version from 60.9.0 through 68.0.x, or is 68.0 for ESR

You are affected if any installed instance of Firefox or Thunderbird matches the affected version ranges: Firefox non-ESR before 69.0, Firefox ESR 68.0, or Thunderbird before 60.9.0 or between 68.0 and 68.1.0.

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 60.9.0 / 68.1.0 / 69.0 or later
Fixed in 60.9.068.1.069.0
Interim mitigation

Update affected products to patched versions: Firefox 69+, Thunderbird 68.1+ or 60.9+, Firefox ESR 60.9+ or 68.1+. Organizations should deploy browser updates via their patch management systems.

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA2.0 h
10.0 hours of engineering $1,780
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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-2019-11742 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