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CWE

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CVE-2011-10018

Published: Aug 13, 2025

Modified: Apr 7, 2026

PUBLISHED

Description

myBB version 1.6.4 was distributed with an unauthorized backdoor embedded in the source code. The backdoor allowed remote attackers to execute arbitrary PHP code by injecting payloads into a specially crafted collapsed cookie. This vulnerability was introduced during packaging and was not part of the intended application logic. Exploitation requires no authentication and results in full compromise of the web server under the context of the web application.

Vendor	Product	Versions
myBB Group	Forum Software	affected `1.6.4`

Weaknesses (CWE)

References

https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/webapp/mybb_backdoor.rb

exploit

https://www.exploit-db.com/exploits/17949

exploit

https://web.archive.org/web/20111015224948/http://secunia.com/advisories/46300/

third-party-advisory

https://blog.mybb.com/2011/10/06/1-6-4-security-vulnerabilit/

vendor-advisory

patch

https://www.vulncheck.com/advisories/mybb-backdoor-arbitrary-command-execution

third-party-advisory

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