SQL injection in MyBB - CVE-2021-27890
Published: March 17, 2021 / Updated: April 7, 2022
Vulnerability identifier: #VU51539
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber
CVE-ID: CVE-2021-27890
CWE-ID: CWE-89
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: MyBB Group
Affected software:
MyBB
MyBB
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary SQL queries in database.
The vulnerability exists due to insufficient sanitization of user-supplied data within the theme properties included in theme XML files. A remote attacker can send a specially crafted request to the affected application and execute arbitrary SQL commands within the application database.
Successful exploitation of this vulnerability may allow a remote attacker to read, delete, modify data in database and gain complete control over the affected application.
How to mitigate CVE-2021-27890
Cybersecurity Help is currently unaware of any official solution to address this vulnerability..