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CVE-2011-10018

myBB 1.6.4 Backdoor Arbitrary Command Execution

Published: Aug 13, 2025Updated: Aug 14, 2025 Sources: CVE List NVDCWE-94
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
1.9%
Top 23.5%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-94CWE-912

Affected Products

mybbmybbWeb & CMS Plugins
Forum SoftwaremyBB Group
Mixed
Web & CMS Plugins / forum-wiki
mybboss-projectWeb & CMS Pluginsaka mybb forums
mybb groupWeb & CMS Plugins

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://blog.mybb.com/2011/10/06/1-6-4-security-vulnerabilit/
blog.mybb.com
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/webapp/mybb_backdoor.rb
raw.githubusercontent.com
https://web.archive.org/web/20111015224948/http://secunia.com/advisories/46300/
web.archive.org
and 2 more references View all →

Timeline

Published
Aug 13, 2025
Last Updated
Aug 14, 2025

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