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5.8

Firefox can show fake script origin names

CVE-2009-4130 · published 16 years ago
Summary

Firefox’s dialog box that shows a script’s source can be tricked by a very long name, causing the displayed domain to be cut off and appear as a different site. This could let attackers make users think a script comes from a trusted site. Updating Firefox to the latest version fixes the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
mozilla firefox All versions
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Original advisory text
Visual truncation vulnerability in the MakeScriptDialogTitle function in nsGlobalWindow.cpp in Mozilla Firefox allows remote attackers to spoof the origin domain name of a script via a long name.
Visual truncation vulnerability in the MakeScriptDialogTitle function in nsGlobalWindow.cpp in Mozilla Firefox allows remote attackers to spoof the origin domain name of a script via a long name.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
5.8 Medium
Exploitation
<1% chance of attack within 30 days
Timeline
Published14 Dec 2009
Updated3 Nov 2026
First seen29 Sep 2026
Sources
CVE-2009-4130 · NVD
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