Severity: Critical (CVSS 10)

Affected Systems: Affected products listed by OpenCVE and the vendor advisory

Overview

Command Permission Bypass via Unparsed Shell Constructs in Mistral Vibe

A critical vulnerability identified as CVE-2026-87986 has been disclosed.

An arbitrary code execution vulnerability in Mistral Vibe allows an attacker to bypass command permission checks using shell constructs it's parser cannot interpret. Unparsed portions are omitted from inspection, enabling embedded commands to execute on the user's system without approval.

Risk

CVSS and CISA data indicate the following:

  • Review the OpenCVE and vendor advisory for exploit conditions and impact

OpenCVE Analysis

CVSS v4.0 10 CriticalCVSS v3.1 N/ACVSS v3.0 N/ACVSS v2 N/AKEV noEPSS noSSVC yes

  • OpenCVE title: Command Permission Bypass via Unparsed Shell Constructs in Mistral Vibe
  • Severity score: Critical (CVSS 10)
  • SSVC Automatable: yes
  • SSVC Exploitation: none
  • SSVC Technical Impact: total
  • Weaknesses: CWE-228

Required Action

Review the OpenCVE detail page and linked vendor advisory, then apply the vendor-provided update or mitigation for the affected product.

Prioritize systems where the affected product is internet-facing, handles authentication, or runs with elevated privileges.

Verify Updates

Confirm whether your environment uses the affected product(s): Affected products listed by OpenCVE and the vendor advisory.

After remediation, verify the installed version against the fixed or unaffected versions listed by the vendor.

Temporary Mitigation (if patch is not available)

Use the mitigation published by the vendor. If no vendor mitigation is available, reduce exposure to the affected product, restrict access to trusted users or networks, and increase monitoring until an update can be applied.

Recommendation

  • Use OpenCVE, vendor, and source references as the source of truth for affected versions and remediation
  • Patch or mitigate affected products after confirming exposure in your environment
  • Monitor affected systems for unusual activity until remediation is complete

Support

If you require assistance, please contact our support team.

Immediate action is strongly recommended to protect your infrastructure.

Source Details

Customer Responsibility and Backups

Before applying updates, mitigations, or configuration changes, customers should take and verify current backups or snapshots of affected systems.

Customers are responsible for managing their servers, validating their own backups, testing changes, and ensuring they can restore services if an update or mitigation causes an issue.



Friday, September 11, 2026

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