CVE-2026-6915: 
MongoDB vulnerability analysis and mitigation

CVE-2026-6915 is an authorization flaw in MongoDB's user management command that allows an authenticated, low-privileged user to make limited changes to authentication-related data associated with another user account, potentially affecting how authentication is performed for the impacted account. The vulnerability affects MongoDB Server versions 7.0.0–7.0.31, 8.0.0–8.0.20, and 8.2.0–8.2.6. It was published on April 29, 2026, with patches available shortly thereafter. The CVSS v3.1 base score is 4.3 (Medium), while the CVSS v4.0 base score is 5.3 (Medium) (GitHub Advisory, MongoDB Jira).

The root cause is classified as CWE-1284 (Improper Validation of Specified Quantity in Input), reflecting insufficient authorization checks within the user management command that fail to properly restrict which accounts an authenticated user may modify. An attacker with low-level network access and valid credentials can invoke the affected user management command with parameters targeting another user's account, bypassing the expected authorization boundary. No special conditions, user interaction, or elevated privileges beyond basic authentication are required to trigger the flaw. No public proof-of-concept or detailed technical write-up has been identified at this time (GitHub Advisory, MongoDB Jira).

Successful exploitation allows a low-privileged authenticated attacker to alter authentication-related data for other user accounts, which could disrupt or manipulate how those accounts authenticate to MongoDB. This could facilitate unauthorized access to targeted accounts, potential privilege escalation, or lateral movement within systems relying on the affected user management functionality. Confidentiality impact is limited (no direct data disclosure), but integrity of authentication configuration is at risk, and availability of affected accounts may be impacted if authentication is disrupted (GitHub Advisory).

MongoDB has released patched versions addressing this vulnerability: 7.0.32, 8.0.21, and 8.2.7. Organizations should upgrade to these versions promptly. As interim mitigations, administrators should implement strict access controls on user management commands, restrict network access to MongoDB instances, monitor user management activities for unauthorized modifications to authentication data, and audit existing accounts for any unauthorized authentication changes (MongoDB Jira, GitHub Advisory).