CVE-2026-8431 MongoDB, Inc. CVE debrief

Who should care

MongoDB Ops Manager administrators and users with access to webhook configuration should assess exposure and take remediation steps. This includes reviewing and restricting access to webhook configuration, updating to a non-vulnerable version, and monitoring for suspicious activity. The vulnerability has a high CVSS score of 9.4, indicating a severe risk of potential command execution, elevation of privileges, and service disruption.

Why it matters

CVE-2026-8431 is a critical vulnerability in MongoDB Ops Manager that allows administrative users to execute arbitrary commands via webhook configuration. MongoDB Ops Manager administrators and users with access to webhook configuration should assess exposure and take remediation steps, including reviewing and restricting access to webhook configuration, updating to a non-vulnerable version, and monitoring for suspicious activity. The vulnerability has a high CVSS score of 9.4 and requires immediate attention.

• Potential for arbitrary command execution
• Elevation of privileges for administrative users
• Possible disruption of service
• Need for verification of affected versions and remediation

Technical summary

CVE-2026-8431 is a critical vulnerability in MongoDB Ops Manager versions 7.0 and 8.0.22 and prior. An administrative user with access to configure webhooks can execute arbitrary commands by configuring and triggering webhooks containing specific FreeMarker template syntax. This vulnerability allows for potential command execution, elevation of privileges, and service disruption. Immediate attention is required to assess exposure and implement remediation steps, including reviewing and restricting access to webhook configuration, updating to a non-vulnerable version, and monitoring for suspicious activity.

Defensive priority

High

Recommended defensive actions

• Review and restrict access to webhook configuration
• Update to a non-vulnerable version of MongoDB Ops Manager
• Monitor for suspicious webhook activity
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. The MongoDB documentation also provides release notes that may be relevant. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability. Defenders should verify affected versions, review webhook configurations, and monitor for suspicious activity.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.