How severe is CVE-2026-22808?

CVE-2026-22808 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-22808 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-22808?

CVE-2026-22808 primarily affects Fleetdm Fleet. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-22808?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-22808 have an EU (EUVD) identifier?

Yes. CVE-2026-22808 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3350.

When was CVE-2026-22808 published?

CVE-2026-22808 was published on 2026-01-21 and last updated on 2026-06-17.

CVE-2026-22808

CVE-2026-22808 is a medium-severity vulnerability in Fleetdm Fleet with a CVSS 3.x base score of 5.4. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v4: 5.5
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3350
Weakness: CWE-79
Affected product: Fleetdm Fleet
Published: 2026-01-21
Last modified: 2026-06-17

Description

fleetdm/fleet is open source device management software. Prior to versions 4.78.2, 4.77.1, 4.76.2, 4.75.2, and 4.53.3, if Windows MDM is enabled, an unauthenticated attacker can exploit this XSS vulnerability to steal a Fleet administrator's authentication token (FLEET::auth_token) from localStorage. This could allow unauthorized access to Fleet, including administrative access, visibility into device data, and modification of configuration. Versions 4.78.2, 4.77.1, 4.76.2, 4.75.2, and 4.53.3 fix the issue. If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.

Frequently asked questions

What is CVE-2026-22808?: fleetdm/fleet is open source device management software. Prior to versions 4.78.2, 4.77.1, 4.76.2, 4.75.2, and 4.53.3, if Windows MDM is enabled, an unauthenticated attacker can exploit this XSS vulnerability to steal a Fleet administrator's authentication token (FLEET::auth_token) from localStorage. This could allow unauthorized access to Fleet, including administrative access, visibility into device data, and modification of configuration. Versions 4.78.2, 4.77.1, 4.76.2, 4.75.2, and 4.53.3 fix the issue. If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.
How severe is CVE-2026-22808?: CVE-2026-22808 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-22808 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-22808?: CVE-2026-22808 primarily affects Fleetdm Fleet. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-22808?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-22808 have an EU (EUVD) identifier?: Yes. CVE-2026-22808 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3350.
When was CVE-2026-22808 published?: CVE-2026-22808 was published on 2026-01-21 and last updated on 2026-06-17.

References

https://github.com/fleetdm/fleet/security/advisories/GHSA-gfpw-jgvr-cw4j

Affected products (2)

cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*
cpe:2.3:a:fleetdm:fleet:4.77.0:*:*:*:*:*:*:*

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