Is This vulnerability exploited in the wild?

No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

How severe is This vulnerability?

Medium severity, with a CVSS score of 5.3, published 20 August 2026.

Which products and versions are affected?

github.com/fleetdm/fleet/v4 (Go) < 4.87.0.

Is there a fix for This vulnerability?

A patch was published on 2026-08-20: Patch released in Fleet v4.87.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is This vulnerability attacked?

It is attacked over the network, in a hosted service.

Check whether you run github.com/fleetdm/fleet/v4 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Fleet missing authorization in iOS app endpoints

Q: Is there a fix for This vulnerability?

A patch was published on 2026-08-20: Patch released in Fleet v4.87.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is This vulnerability attacked?

It is attacked over the network, in a hosted service.

Q: Am I affected?

Check whether you run github.com/fleetdm/fleet/v4 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Severity: medium · CVSS 5.3 · Published 2026-08-20

Fleet is a mobile device management (MDM) platform used by enterprises to deploy and manage iOS applications on company-owned devices. Two endpoints that serve in-house iOS app packages lack proper authentication controls, allowing an attacker with network access to the Fleet server to download proprietary application binaries and metadata. While the leaked data is read-only, this could expose sensitive business applications or intellectual property. The vulnerability is limited to enterprise-tier deployments only.

Technologies: github.com/fleetdm/fleet/v4 (Go). Vendors: Go.

Quick answers

Is This vulnerability exploited in the wild?: No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?: Medium severity, with a CVSS score of 5.3, published 20 August 2026.
Which products and versions are affected?: github.com/fleetdm/fleet/v4 (Go) < 4.87.0.
Is there a fix for This vulnerability?: A patch was published on 2026-08-20: Patch released in Fleet v4.87.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is This vulnerability attacked?: It is attacked over the network, in a hosted service.
Am I affected?: Check whether you run github.com/fleetdm/fleet/v4 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This vulnerability is a missing authorization flaw (CWE-862) in Fleet's in-house iOS application serving endpoints. The endpoints are designed to be network-reachable by managed iOS devices (as required by Apple's InstallEnterpriseApplication MDM command) but lack the random, hard-to-guess token pattern implemented in Fleet's legacy MDM installer path. An unauthenticated attacker with network access to the Fleet server can enumerate in-house app identifiers sequentially and download IPA binaries along with metadata (bundle ID, version, name) without authentication. The attack requires network reachability to the Fleet server and succeeds without user interaction or prior privileges. A patch is available in Fleet v4.87.0 which implements time-limited token validation for these endpoints.

Affected products

Fleet Fleet < 4.87.0

Timeline

2026-08-11: disclosed
2026-08-20: patched: Patch released in Fleet v4.87.0

References

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