CVE-2026-87984

Arbitrary File Write via Shell Redirection in Mistral Vibe

Published Sep 11, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Description
An arbitrary file write vulnerability in Mistral Vibe, introduced in version 1.3.4, allows an attacker to create or overwrite files outside the active workspace without user approval. Shell redirection destinations are omitted from permission checks, enabling otherwise allowlisted commands to write to arbitrary paths accessible to the Vibe process.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Mistral
Mistral mistral-vibe
Vendors & Products Mistral
Mistral mistral-vibe
Type Values Removed Values Added
Title Arbitrary File Write via Shell Redirection in Mistral Vibe
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description An arbitrary file write vulnerability in Mistral Vibe, introduced in version 1.3.4, allows an attacker to create or overwrite files outside the active workspace without user approval. Shell redirection destinations are omitted from permission checks, enabling otherwise allowlisted commands to write to arbitrary paths accessible to the Vibe process.
Weaknesses CWE-22
References
Metrics cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
HiddenLayer
Published
Updated
Sep 11, 2026, 2:57 PM
Reserved
Sep 9, 2026, 7:14 PM
Status
Deferred
Published
Sep 11, 2026, 3:17 PM
Modified
Sep 11, 2026, 5:35 PM