crmeb_java EUVD-2026-26807

Exploitation requires valid high-level administrative credentials (PR:H) to access the Admin Upload functionality within UploadServiceImpl.java. The attacker must be able to reach the upload endpoint via network (AV:N), typically from a remote location. No user interaction is required (UI:N) once authenticated. The primary limiting condition is the PR:H privilege requirement - exploitation is restricted to authenticated admins or accounts that have been compromised to obtain admin privileges. Secondary constraints include proper network routing to the admin upload endpoint and the application must be running with standard configurations that allow file uploads. No special non-default configuration of the vulnerability itself is required; the flaw exists in default deployments.

CVSS 4.7 with network attack vector and low complexity, but requiring high-level privileges (PR:H), suggests moderate baseline risk. However, the exploitation probability is elevated by publicly available POC code (E:P flag in CVSS vector) and confirmed proof-of-concept availability via external sources. The key limiting factor is the PR:H requirement - only authenticated users with admin-level access can trigger the exploit. The confidentiality, integrity, and availability impact ratings (all L for Low) indicate file upload as the primary concern rather than direct RCE, though uploaded files could potentially enable secondary attacks depending on application architecture and file execution context. The RC:R (Reasonable confidence) tag reflects that VulDB assessment is based on available reporting rather than vendor confirmation. Real-world risk depends heavily on the deployment context: if the admin interface is exposed to untrusted networks or if admin credentials are compromised, risk escalates significantly. The vendor's non-response to early disclosure is a negative signal regarding patch timeline.

An authenticated administrative user with compromised credentials, or an insider threat with admin access, crafts a request to the UploadServiceImpl endpoint and manipulates the model parameter to bypass file type restrictions. They upload a malicious file (such as a JSP, executable, or script) which is stored in a directory accessible to the application's runtime environment. Depending on the server configuration, this could enable remote code execution, privilege escalation, or lateral movement within the application infrastructure.