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.
History

Thu, 14 Aug 2025 17:45:00 +0000

Type Values Removed Values Added
First Time appeared Mybb
Mybb mybb
CPEs cpe:2.3:a:mybb:mybb:1.6.4:*:*:*:*:*:*:*
Vendors & Products Mybb
Mybb mybb
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Thu, 14 Aug 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 13 Aug 2025 20:45:00 +0000

Type Values Removed Values Added
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.
Title myBB 1.6.4 Backdoor Arbitrary Command Execution
Weaknesses CWE-912
CWE-94
References
Metrics cvssV4_0

{'score': 10, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2025-08-13T20:35:31.755Z

Updated: 2025-08-14T14:08:01.308Z

Reserved: 2025-08-13T17:52:08.905Z

Link: CVE-2011-10018

cve-icon Vulnrichment

Updated: 2025-08-14T14:07:45.471Z

cve-icon NVD

Status : Analyzed

Published: 2025-08-13T21:15:29.387

Modified: 2025-08-14T17:42:18.333

Link: CVE-2011-10018

cve-icon Redhat

No data.