How severe is CVE-2026-87988?

CVE-2026-87988 has a CVSS 4.0 base score of 10.0, rated critical severity.

Is CVE-2026-87988 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-87988?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2026-87988 published?

CVE-2026-87988 was published on 2026-09-11.

CVE-2026-87988

CVE-2026-87988 is a critical-severity vulnerability with a CVSS 4.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-732.

Key facts

Severity: Critical (CVSS 4.0 base score 10.0)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-732
Published: 2026-09-11
Last modified: 2026-09-11

Description

An arbitrary file access vulnerability in Mistral Vibe allows an attacker to bypass workspace restrictions through commands classified as unconditionally allowed. Missing path validation for these commands enables access to files outside the active workspace without user approval.

Frequently asked questions

What is CVE-2026-87988?: An arbitrary file access vulnerability in Mistral Vibe allows an attacker to bypass workspace restrictions through commands classified as unconditionally allowed. Missing path validation for these commands enables access to files outside the active workspace without user approval.
How severe is CVE-2026-87988?: CVE-2026-87988 has a CVSS 4.0 base score of 10.0, rated critical severity.
Is CVE-2026-87988 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-87988?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2026-87988 published?: CVE-2026-87988 was published on 2026-09-11.

References

https://www.hiddenlayer.com/sai-security-advisory/2026-09-mistral-vibe6

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