Critical Improper Authentication Flaw CVE-2026-103264 Disclosed in Fleetdm fleet
A newly published critical vulnerability in Fleetdm fleet carries a CVSS score of 9.3. Here is what is affected and how to respond.
Key points
- CVE-2026-103264 affects Fleetdm fleet.
- CVSS 9.3 (Critical).
- No exploitation confirmed yet.
Fleetdm fleet is affected by CVE-2026-103264, a improper authentication that the National Vulnerability Database rates 9.3 out of 10.
At a glance
- CVE
- CVE-2026-103264
- Product
- Fleetdm fleet
- CVSS
- 9.3 Critical
- Weakness
- improper authentication
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: Fleet versions before 4.87.0 contain an authentication bypass vulnerability in the device API that accepts hostnames and hardware serials as authentication tokens in addition to device UUIDs. Unauthenticated attackers who know or guess these non-secret identifiers can authenticate as iOS/iPadOS hosts to read device data and trigger device-scoped actions including software installation and MDM migration.
Affected versions
| Vendor | Product | Versions |
|---|---|---|
| Fleetdm | fleet | before 4.87.0 |
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-103264
- Patch scores alone ignore context like network exposure and asset criticality.
- You must map vulnerabilities to specific business risks to prioritize correctly.
- Continuous exposure data replaces static scanning for accurate prioritization.
Prioritize vulnerabilities by actual exploitability and business impact, not by theoretical severity scores. Update your asset context and exposure data continuously to maintain accurate risk rankings.
Step-by-step guide: Risk Based Vulnerability Management: Prioritize Fixes by Actual Threat
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-103264?
CVE-2026-103264 is a improper authentication vulnerability in Fleetdm fleet.
How severe is CVE-2026-103264?
It has a CVSS score of 9.3 Critical.
Is CVE-2026-103264 being exploited?
There is no public confirmation of exploitation at the time of publication.
