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Vulnerability record · CVE-2026-87984 · published 11 September 2026

CVE-2026-87984: Path traversal vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.50% · top 59.9% CWE-22 · Path traversal Deferred
9.3CVSS 4.0 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
11 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://www.hiddenlayer.com/sai-security-advisory/2026-09-mistral-vibe2

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Source: NIST National Vulnerability Database (record CVE-2026-87984), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.