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CVE-2011-10018

44
FAUCET Score

CVE-2011-10018 describes a critical backdoor in myBB version 1.6.4, allowing remote attackers to execute arbitrary PHP code. This vulnerability, introduced during packaging, leverages specially crafted collapsed cookies and requires no authentication. With a CVSS score of 9.8, it poses a severe risk, enabling full web server compromise under the web application's context. While not on the KEV catalog, a Metasploit module exists, and community discussion indicates awareness of this high-impact flaw.

Impacted Technologies

VendorProductVersion(s)CPE
1.6.4CPE matchmatch criteria
cpe:2.3:a:mybb:mybb:1.6.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

10.0CRITICAL

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
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
HIGH
SS Confidentiality
HIGH
SS Integrity
HIGH
SS Availability
HIGH
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
1.98%
Probability of exploitation in next 30 days
EPSS Percentile
78.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
Metasploit: myBB 1.6.4 Backdoor Arbitrary Command Execution · Oct 6, 2011
This CVE's current EPSS score of 0.0198 is in the 67th percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

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