Vulnerability Note VU#575969

Mozilla may process content-defined setters on object prototypes with elevated privileges

Original Release date: 02 Jun 2006 | Last revised: 09 Feb 2007


Mozilla allows content-defined setters on object prototypes to execute with elevated privileges. This may allow a remote attacker to execute arbitrary code.



A setter is a method in JavaScript that sets the value of a property.

The problem

The setters in Mozilla are called by privileged user interface (UI) code. This elevated privilege can be passed on to the content-provided JavaScript code. Mozilla Firefox and Thunderbird are reported to be vulnerable.


The complete impact of this vulnerability is not yet known.


Apply an update
Refer to Mozilla Foundation Security Advisory 2006-37 for fixed versions of Mozilla products.

Disable JavaScript

This vulnerability can be mitigated by disabling JavaScript.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Mozilla, Inc.Affected-02 Jun 2006
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



Thanks to the Mozilla Foundation Security Advisory for reporting this vulnerability, who in turn credit Paul Nickerson and moz_bug_r_a4.

This document was written by Will Dormann.

Other Information

  • CVE IDs: CVE-2006-2776
  • Date Public: 01 Jun 2006
  • Date First Published: 02 Jun 2006
  • Date Last Updated: 09 Feb 2007
  • Severity Metric: 11.48
  • Document Revision: 13


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