FirefoxWeb browser · Mozilla
CVE-2019-11711
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 · uneditedWhen an inner window is reused, it does not consider the use of document.domain for cross-origin protections. If pages on different subdomains ever cooperatively use document.domain, then either page can abuse this to inject script into arbitrary pages on the other subdomain, even those that did not use document.domain to relax their origin security. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.
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 confidenceWhen an inner browser window is reused, the browser fails to properly consider document.domain settings that provide cross-origin protection between subdomains. This allows a page on one subdomain that has set document.domain to inject malicious script into arbitrary pages on another subdomain, even pages that did not use document.domain to relax their origin security, bypassing same-origin policy protections.
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
< 60.8.0< 68.0
Debian LinuxOperating system
= 8.0< 60.8.0CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Check Firefox versionRun 'firefox --version' in terminal, or open Firefox and navigate to Help > About Firefox to view the version numberAffected if Version is earlier than 60.8.0, or between 60.8.0 and 68.0 (non-ESR releases)
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Check Thunderbird versionRun 'thunderbird --version' in terminal, or open Thunderbird and navigate to Help > About Thunderbird to view the version numberAffected if Version is earlier than 60.8.0
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Identify document.domain usage in web applicationsSearch source code repositories for 'document.domain' assignments using grep or similar tools: grep -r 'document.domain' /path/to/webappAffected if Any web application hosted on subdomains sets document.domain to relax origin security boundaries
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Determine if affected browser hosts subdomain contentReview whether the browser is used to access multiple subdomain sites where one subdomain could inject into anotherAffected if Browser accesses web applications across different subdomains where document.domain is in use
Environment is affected if running an affected Firefox or Thunderbird version AND serving or accessing web applications that utilize document.domain to relax same-origin policy between subdomains.
Generated from the published advisory. Verify against your own configuration.
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 data60.8.068.0
Update affected products to fixed versions (Firefox ESR 60.8+, Firefox 68+, Thunderbird 60.8+). Additionally, review and minimize use of document.domain in web applications as it weakens origin security boundaries.
Fix this in Firefox
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,808.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-11711 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2019-11711 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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