Opera onUnload URL spoofing

opera-onunload-url-spoofing (16131) The risk level is classified as MediumMedium Risk


Opera could allow a remote attacker to spoof a trusted Web page by altering the URL that is displayed in the address bar. A remote attacker could modify the HTML onUnload attribute in such a way that a redirection to another Web site is not displayed in the address bar. An attacker could use this vulnerability to gain sensitive information from unsuspecting users.


Obtain Information


Upgrade to the latest version of Opera (7.50 or later), available from the Opera Web site. See References.


  • Opera Web site: Opera Internet Browser.
  • BID-10337: Opera Web Browser Address Bar Spoofing Weakness
  • CVE-2004-2260: Opera Browser 7.23, and other versions before 7.50, updates the address bar as soon as the user clicks a link, which allows remote attackers to redirect to other sites via the onUnload attribute.
  • OSVDB ID: 6108: Opera onUnload Address Bar Spoofing
  • SA11532: Opera Browser Address Bar Spoofing Vulnerability

Platforms Affected:

  • Opera Opera Browser 7.23


May 13, 2004

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