CVE-2011-10018

high-risk
Published 2025-08-13

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.

Do I need to act?

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53.0% chance of exploitation in next 30 days
EPSS score — higher than 47% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Mybb

References (7)

Vendor Advisory https://blog.mybb.com/2011/10/06/1-6-4-security-vulnerabilit/
Product https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exp...
Third Party Advisory https://web.archive.org/web/20111015224948/http://secunia.com/advisories/46300/
Exploit https://www.exploit-db.com/exploits/17949
Third Party Advisory https://www.vulncheck.com/advisories/mybb-backdoor-arbitrary-command-execution
Product https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exp...
Exploit https://www.exploit-db.com/exploits/17949
55
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 18/34 · Moderate
Exposure 5/34 · Minimal