YaBB invalid thread topic error page cross-site scripting

yabb-invalid-thread-xss (9408) The risk level is classified as MediumMedium Risk


YaBB (Yet Another Bulletin Board) is vulnerable to cross-site scripting. A remote attacker can create a specially-crafted URL link, containing malicious script, to a thread topic that does not exist, which would be executed in the victim's Web browser within the security context of the hosting site, once the link is clicked. An attacker could use this vulnerability to steal a victim's cookie-based authentication credentials.


Obtain Information


No remedy available as of September 1, 2014.


  • BugTraq Mailing List, Fri Jun 21 2002 - 10:08:24 CDT: [AP] YaBB Cross-Site Scripting vulnerability.
  • YaBB Web site: Welcome to YaBB.
  • BID-5078: YaBB Invalid Topic Error Page Cross Site Scripting Vulnerability
  • CVE-2002-0955: Cross-site scripting vulnerability in YaBB.cgi for Yet Another Bulletin Board (YaBB) 1 Gold SP1 and earlier allows remote attackers to execute arbitrary script as other web site visitors via script in the num parameter, which is not filtered in the resulting error message.
  • OSVDB ID: 9234: YaBB YaBB.cgi num Parameter XSS

Platforms Affected:

  • YaBB YaBB 1 Gold SP1 and prior


Jun 21, 2002

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