5.5

CVE-2026-22808: fleetdm fleet Cross-site Scripting

CVSS: 5.5v4.0MediumAnalyzed
AliasesGHSA-gfpw-jgvr-cw4jGO-2026-4336
Published 21-01-2026Last modified 22-01-2026
Open JSON

Vulnerability summary

CVE-2026-22808 is a medium (CVSS 5.5) Cross-site Scripting vulnerability in fleetdm fleet. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.25%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:0403-1

Timeline

  1. 21-01-2026
    PublishedVulnerability first disclosed.
  2. 22-01-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

0.00 pp

From 0.25% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.25%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Fleetdm1 product
  • fleet≥ 4.77.0, < 4.77.1 | < 4.53.3 | ≥ 4.75.0, < 4.75.2 | ≥ 4.76.0, < 4.76.2 | ≥ 4.78.0, < 4.78.2 | 4.77.0
Github.com/fleetdm1 product
  • fleet≥ 4.78.0, < 4.78.2 | ≥ 4.77.0, < 4.77.1 | ≥ 4.76.0, < 4.76.2 | ≥ 4.75.0, < 4.75.2
Github.com/fleetdm/fleet1 product
  • v4< 4.43.5-0.20260111020427-0e6c790803d1 | ≥ 4.78.0, < 4.78.2

3 vendors · 3 products

References

4 links