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FirefoxWeb browser · Mozilla

CVE-2019-11712

HIGH · 8.8 CVSS v3.0 Published 2019-07-23
Fix available
A fix is available. Upgrade to 60.8.0 / 68.0 or later.
See remediation →
95/100
Remediation priority · Urgent
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
POST requests made by NPAPI plugins, such as Flash, that receive a status 308 redirect response can bypass CORS requirements. This can allow an attacker to perform Cross-Site Request Forgery (CSRF) attacks. 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 confidence

NPAPI plugins (e.g., Flash) making POST requests that receive a 308 Permanent Redirect response can bypass CORS (Cross-Origin Resource Sharing) restrictions. This allows attackers to perform Cross-Site Request Forgery (CSRF) attacks by tricking users into making authenticated cross-origin requests that would normally be blocked.

MitigationUpdate affected software to fixed versions: Firefox ESR >= 60.8, Firefox >= 68, or Thunderbird >= 60.8. This is a client-side vulnerability resolved by patching the browser.

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:< 60.8.0< 68.0
ThunderbirdApplication
Affected:< 60.8.0

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
High
Integrity
High
Availability
High

CVSS:3.0/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 checks

Work through these to decide whether this CVE applies to you.

  1. Check installed Firefox version
    Open Firefox, go to Help > About Firefox, or run 'firefox --version' from command line. Note the full version number (e.g., 60.0, 67.0, 68.0).
    Affected if Version is below 60.8.0, or between 60.8.0 and 68.0 (exclusive of 68.0)
  2. Check installed Thunderbird version
    Open Thunderbird, go to Help > About Thunderbird, or run 'thunderbird --version' from command line. Note the full version number.
    Affected if Version is below 60.8.0
  3. Verify if NPAPI plugin support is enabled
    In Firefox, type 'about:addons' in address bar, click 'Plugins' category. Look for NPAPI plugins (e.g., Adobe Flash, Silverlight, Java). Check if they are set to 'Always Activate' or 'Ask to Activate'.
    Affected if Any NPAPI plugin (particularly Flash) is enabled or set to ask for activation

User is affected if they have Firefox version < 60.8.0 or < 68.0, or Thunderbird < 60.8.0, AND have NPAPI plugin support enabled in the browser.

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 60.8.0 / 68.0 or later
Fixed in 60.8.068.0
Interim mitigation

Update affected software to fixed versions: Firefox ESR >= 60.8, Firefox >= 68, or Thunderbird >= 60.8. This is a client-side vulnerability resolved by patching the browser.

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-2019-11712 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