| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/fleetdm/fleet | ≥ 4.75.0, < 4.75.2≥ 4.76.0, < 4.76.2≥ 4.77.0, < 4.77.1≥ 4.78.0, < 4.78.2 | 4.75.24.76.24.77.14.78.2 |
| github.com/fleetdm/fleet/v4 | ≥ 4.75.0, < 4.75.2≥ 4.76.0, < 4.76.2≥ 4.77.0, < 4.77.1≥ 4.78.0, < 4.78.2< 4.43.5-0.20260111020427-0e6c790803d1 | 4.75.24.76.24.77.14.78.24.43.5-0.20260111020427-0e6c790803d1 |
| fleet | = 4.77.0≥ 4.75.0, < 4.75.2≥ 4.76.0, < 4.76.2≥ 4.78.0, < 4.78.2< 4.53.3 | 4.75.24.76.24.78.24.53.3 |
A cross-site scripting (XSS) vulnerability in Fleet’s Windows MDM authentication flow could allow an attacker to compromise a Fleet user account. In certain cases, this could lead to administrative access and the ability to perform privileged actions on managed devices.
If Windows MDM is enabled, an attacker could exploit a cross-site scripting (XSS) vulnerability by convincing an authenticated Fleet user to visit a malicious link. Successful exploitation could allow retrieval of the user’s Fleet authentication token from their browser.
A compromised authentication token may grant administrative access to the Fleet API, allowing an attacker to perform privileged actions such as deploying scripts to managed hosts.
This issue does not allow unauthenticated access and does not affect instances where Windows MDM is disabled.
If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.
If you have any questions or comments about this advisory:
Email us at [email protected] Join #fleet in osquery Slack
We thank @secfox-ai for responsibly reporting this issue.
Running one of these products? Scan your site to see whether it exposes a vulnerable version.
Scan my site free