CVE-2026-1152 identifies an unrestricted file upload vulnerability in the technical-laohu mpay product, specifically within the QR Code Image Handler component. The flaw arises from improper validation or sanitization of the 'codeimg' argument, enabling attackers to upload arbitrary files remotely. The vulnerability affects versions 1.2.0 through 1.2.4. Exploitation requires the attacker to have high privileges (PR:H), but no user interaction or authentication bypass is needed. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P) indicates network attack vector, low attack complexity, no attack or user interaction, but requiring privileges. The impact on confidentiality, integrity, and availability is low, suggesting that while arbitrary files can be uploaded, the scope of damage is limited, possibly due to sandboxing or other controls. No patches or exploit code are currently publicly available, and no known active exploitation has been reported. The vulnerability's presence in a payment-related application raises concerns about potential misuse for webshell deployment, data tampering, or denial of service if exploited. However, the requirement for elevated privileges reduces the risk of widespread exploitation by external attackers without prior access.

For European organizations, especially those in the financial and payment sectors using technical-laohu mpay, this vulnerability could allow attackers with elevated privileges to upload malicious files, potentially leading to unauthorized code execution, data manipulation, or service disruption. Although the impact is rated medium and the required privileges limit the attack surface, insider threats or compromised accounts could leverage this flaw to escalate attacks. The ability to upload arbitrary files might facilitate webshell installation or malware deployment, threatening confidentiality and integrity of sensitive payment data. Availability could also be affected if malicious uploads disrupt service components. Organizations relying on mpay for transaction processing or customer interactions may face operational risks and reputational damage if exploited. The lack of known exploits in the wild provides a window for proactive mitigation, but the public disclosure increases the risk of future attacks.

1. Immediately upgrade technical-laohu mpay to a version beyond 1.2.4 once patches are released by the vendor. 2. Until patches are available, implement strict server-side validation of uploaded files, restricting allowed file types and sizes to only those necessary for QR code processing. 3. Enforce least privilege principles to limit the number of users with high privileges capable of exploiting this vulnerability. 4. Employ web application firewalls (WAF) with custom rules to detect and block suspicious upload attempts targeting the 'codeimg' parameter. 5. Monitor logs for unusual file upload activity or access patterns related to the QR Code Image Handler. 6. Conduct regular security audits and penetration testing focusing on file upload functionalities. 7. Isolate the upload handling component in a sandboxed environment to minimize potential damage from malicious files. 8. Educate internal users about the risks of privilege misuse and enforce strong authentication and access controls.