CVE-2011-10018
myBB 1.6.4 Backdoor Arbitrary Command Execution
- State
- Published
- Severity
- 10.0 Critical
- Published
- Aug 13, 2025
- Updated
- Apr 7, 2026
- Reserved
- Aug 13, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 10.0 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H | VulnCheck |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
Forum SoftwaremyBB Group |
|
References
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/webapp/mybb_backdoor.rbexploit
- https://www.exploit-db.com/exploits/17949exploit
- 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-advisorypatch
- https://www.vulncheck.com/advisories/mybb-backdoor-arbitrary-command-executionthird-party-advisory
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