phpBB cross-site scripting using BBCode image tags

phpbb-bbcode-image-xss (9178) The risk level is classified as MediumMedium Risk


phpBB is vulnerable to cross-site scripting. A remote attacker could embed malicious script in a forum message within BBCode image tags by using a double quotation character (") to escape the image source location and insert arbitrary script. The script would be executed within a victim's Web browser once the message is viewed. An attacker could use this vulnerability to steal a user's cookie-based authentication credentials.


Obtain Information


Upgrade to the latest version of phpBB (2.0.1 or later), available from the phpBB Download Web page. See References.


  • BugTraq Mailing List, Sun May 26 2002 - 10:59:33 CDT: Cross Site Scripting Vulnerability in phpBB2's [IMG] tag and remote avatar.
  • phpBB Download Web site: Downloads.
  • BID-4858: PHPBB2 Image Tag HTML Injection Vulnerability
  • CVE-2002-0902: Cross-site scripting vulnerability in phpBB 2.0.0 (phpBB2) allows remote attackers to execute Javascript as other phpBB users by including a http:// and a double-quote () in the [IMG] tag, which bypasses phpBB's security check, terminates the src parameter of the resulting HTML IMG tag, and injects the script.
  • OSVDB ID: 4296: phpBB Crafted IMG BBCode Tag XSS

Platforms Affected:

  • phpBB phpBB 2.0 RC-4


May 26, 2002

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