CVE-2020-22820 is a critical SQL injection vulnerability identified in MKCMS version 6.2, specifically affecting the /ucenter/repass.php endpoint via the 'name' parameter. SQL injection (CWE-89) vulnerabilities allow attackers to inject malicious SQL code into queries executed by the backend database. This can lead to unauthorized data access, data modification, or even complete compromise of the affected system. The vulnerability has a CVSS 3.1 base score of 9.8, indicating a critical severity level. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) reveals that exploitation requires no privileges or user interaction and can be performed remotely over the network with low attack complexity. Successful exploitation can result in full confidentiality, integrity, and availability compromise of the backend database and potentially the entire application environment. Although the vendor and product details are not explicitly specified beyond MKCMS 6.2, the vulnerability resides in a web application component that handles user password reset functionality. The lack of available patches or known exploits in the wild suggests that this vulnerability may be underreported or not yet widely weaponized, but its critical nature demands immediate attention. The vulnerability was reserved in August 2020 and published in November 2022, indicating a significant time gap that may have allowed attackers to develop exploits. The absence of vendor or product information limits precise identification but does not diminish the threat posed by this vulnerability in environments running MKCMS 6.2 or similar versions.

For European organizations using MKCMS 6.2, this vulnerability poses a severe risk. Exploitation could lead to unauthorized access to sensitive user data, including credentials and personal information, resulting in data breaches that violate GDPR and other data protection regulations. The integrity of user accounts could be compromised, enabling attackers to escalate privileges or impersonate legitimate users. Availability impacts could include denial of service or destruction of data, disrupting business operations. Given the critical CVSS score and the fact that no authentication or user interaction is required, attackers can remotely exploit this vulnerability at scale. This could lead to reputational damage, regulatory fines, and financial losses. Organizations in sectors with high-value data, such as finance, healthcare, and government, are particularly at risk. The lack of patches increases the urgency for mitigation. Additionally, the vulnerability could be leveraged as a foothold for further lateral movement within networks, increasing the overall risk profile for affected European entities.

1. Immediate mitigation should include implementing web application firewalls (WAFs) with rules to detect and block SQL injection attempts targeting the /ucenter/repass.php endpoint, especially filtering suspicious input in the 'name' parameter. 2. Conduct thorough code reviews and apply input validation and parameterized queries or prepared statements in the affected code to eliminate SQL injection vectors. 3. If possible, isolate or disable the vulnerable endpoint temporarily until a vendor patch or secure update is available. 4. Monitor logs for unusual database queries or repeated access attempts to the vulnerable endpoint. 5. Employ network segmentation to limit access to the MKCMS application and its database backend. 6. Regularly back up databases and ensure backups are stored securely offline to enable recovery in case of data corruption or deletion. 7. Engage with the MKCMS community or vendor to obtain or request security patches or updates. 8. Educate security teams to prioritize scanning for this vulnerability in penetration tests and vulnerability assessments. 9. Consider deploying runtime application self-protection (RASP) solutions to detect and block injection attacks in real time. These steps go beyond generic advice by focusing on immediate protective controls and proactive detection tailored to the specific vulnerable endpoint and parameter.