CVE-2026-34391

Q: How do I fix CVE-2026-34391?

Upgrade fleet to 4.81.1 or later.

Q: Is CVE-2026-34391 being actively exploited?

Not that we know of. CVE-2026-34391 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.16% is the estimated probability that it will be exploited in the next 30 days. That is higher than 6% of all scored CVEs.

Q: How severe is CVE-2026-34391?

CVE-2026-34391 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-34391 affect?

Published advisories record a fix for fleet (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGH

7.5

CVSS v3

NVD

Description

Fleet is open source device management software. Prior to 4.81.1, a vulnerability in Fleet's Windows MDM command processing allows a malicious enrolled device to access MDM commands intended for other devices, potentially exposing sensitive configuration data such as WiFi credentials, VPN secrets, and certificate payloads across the entire Windows fleet. Version 4.81.1 patches the issue.

CWE-488

How to fix

Remediation Available

fleetNVD

Affected:< 4.81.1Fixed in:4.81.1CVE-2026-34391derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

0.16%probability of exploitation in 30 days

6thpercentile

Low risk: more likely to be exploited than 6% of all known CVEs.

References

Vendor Advisory1

github.com

Related Vulnerabilities

Other CWE-488 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-38367	High	8.2	11%	-	Fix
CVE-2024-6162	High	7.5	1.7%	-	Fix
CVE-2025-1247	High	8.3	0.8%	-	-
CVE-2024-27935	High	7.2	0.7%	-	Fix
CVE-2024-27455	Critical	9.1	0.6%	-	-
CVE-2024-5148	High	7.5	0.6%	-	Fix

Common questions

How do I fix CVE-2026-34391?

Upgrade fleet to 4.81.1 or later.

Is CVE-2026-34391 being actively exploited?

Not that we know of. CVE-2026-34391 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.16% is the estimated probability that it will be exploited in the next 30 days. That is higher than 6% of all scored CVEs.

How severe is CVE-2026-34391?

CVE-2026-34391 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-34391 affect?

Published advisories record a fix for fleet (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-34391

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-02.