CVE-2011-10018

CRITICAL EPSS 76.6%
Published Aug 13, 202510mo ago · Modified Jun 16, 20262w ago
10.0 CVSS 4.0
Critical
Find Similar
Published Aug 13, 2025 10mo ago
Last Modified Jun 16, 2026 2w ago

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 Details

Base Score
10.0
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
76.6% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 2

CWE-912
CWE-94 Improper Control of Generation of Code (Code Injection) Injection

Affected Products 1

VendorProductVersionRange
mybbmybb1.6.4any

References 5

  • blog.mybb.com https://blog.mybb.com/2011/10/06/1-6-4-security-vulnerabilit/
    Vendor Advisory
  • raw.githubusercontent.com https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/webapp/mybb_backdoor.rb
    Product
  • web.archive.org https://web.archive.org/web/20111015224948/http://secunia.com/advisories/46300/
    Third Party Advisory
  • exploit-db.com https://www.exploit-db.com/exploits/17949
    Exploit
  • vulncheck.com https://www.vulncheck.com/advisories/mybb-backdoor-arbitrary-command-execution
    Third Party Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.