CVE-2026-87984
An arbitrary file write vulnerability exists in Mistral Vibe version 1.3.4. It allows an attacker to create or overwrite files outside the active workspace without user approval. Shell redirection destinations bypass permission checks, enabling otherwise allowlisted commands to write to any path the Vibe process can access.
No official fix yet. If none appears within 45 days of first tracking, this entry is removed automatically.
Who is affected
Mistral Vibe version 1.3.4, used by developers and teams that rely on the Vibe workspace.
Real-world impact
An attacker can write arbitrary files on the system, including malicious binaries or configuration changes, effectively compromising the system’s integrity and confidentiality.
Why this severity
The CVSS score of 9.3 reflects that the flaw permits unauthenticated attackers to write files anywhere the Vibe process can access, giving full control over confidentiality, integrity, and availability.
What to do about it
No official fix or mitigation is documented in the sources yet. Monitor the vendor advisory and apply the patch as soon as it is released.
No fix documented in sources