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NVD / CVE Program· CNA GitHub_M

CVE-2026-23517: Fleet has an Access Control vulnerability in debug/pprof endpoints

MediumCVSS 6.3 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 25/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.29% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: github.com/fleetdm/fleet (Go) 4.75.2, 4.76.2, 4.77.1; github.com/fleetdm/fleet/v4 (Go) 4.75.2, 4.76.2, 4.77.1.

Low priority for now. Upgrade to github.com/fleetdm/fleet (Go) 4.75.2, 4.76.2, 4.77.1; github.com/fleetdm/fleet/v4 (Go) 4.75.2, 4.76.2, 4.77.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Fleet is open source device management software. A broken access control issue in versions prior to 4.78.3, 4.77.1, 4.76.2, 4.75.2, and 4.53.3 allowed authenticated users to access debug and profiling endpoints regardless of role. As a result, low-privilege users could view internal server diagnostics and trigger resource-intensive profiling operations. Fleet’s debug/pprof endpoints are accessible to any authenticated user regardless of role, including the lowest-privilege “Observer” role. This allows low-privilege users to access sensitive server internals, including runtime profiling data and in-memory application state, and to trigger CPU-intensive profiling operations that could lead to denial of service. Versions 4.78.3, 4.77.1, 4.76.2, 4.75.2, and 4.53.3 fix the issue. If an immediate upgrade is not possible, users should put the debug/pprof endpoints behind an IP allowlist as a workaround.

Published
Jan 21, 2026
Updated
Jun 17, 2026
EPSS
0.2% · 22th percentile

Report tools

JSON

Action score

25

Monitor

Low priority for now.

CVSS
25 / 40 · 6.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
6.3
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-23517

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
fleetdmfleet

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • fleetdm fleet

    • >= 4.78.0, < 4.78.3, >= 4.77.0, < 4.77.1, >= 4.76.0, < 4.76.2, >= 4.75.0, < 4.75.2, < 4.53.3affected
Affected versions · NVD (5)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • fleetdm fleetbefore 4.53.3
  • fleetdm fleet4.75.0 and later · before 4.75.2
  • fleetdm fleet4.76.0 and later · before 4.76.2
  • fleetdm fleet4.78.0 and later · before 4.78.3
  • fleetdm fleet4.77.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Gogithub.com/fleetdm/fleetfrom 4.75.0 · before 4.75.24.75.2
Gogithub.com/fleetdm/fleetfrom 4.76.0 · before 4.76.24.76.2
Gogithub.com/fleetdm/fleetfrom 4.77.0 · before 4.77.14.77.1
Gogithub.com/fleetdm/fleetfrom 4.78.0 · before 4.78.34.78.3
Gogithub.com/fleetdm/fleet/v4from 4.75.0 · before 4.75.24.75.2
Gogithub.com/fleetdm/fleet/v4from 4.76.0 · before 4.76.24.76.2
Gogithub.com/fleetdm/fleet/v4from 4.77.0 · before 4.77.14.77.1
Gogithub.com/fleetdm/fleet/v4from 4.78.0 · before 4.78.34.78.3
Gogithub.com/fleetdm/fleet/v4before 4.78.3-0.20260112221730-5c030e32a3a94.78.3-0.20260112221730-5c030e32a3a9

Same product

fleetdm: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-26276SAML authentication vulnerability in Fleet
    40Plan
  • CVE-2026-103264Fleet before 4.87.0 Authentication Bypass via Device Identifiers
    37Monitor
  • CVE-2026-23518Fleet has a JWT signature bypass vulnerability in Azure AD MDM enrollment
    37Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2025-27509Mar 6, 2025 · SAML authentication vulnerability due to improper SAML response validation
    37Monitor
  • ← EarlierCVE-2026-22808Jan 21, 2026 · Fleet Windows MDM endpoint has a Cross-site Scripting vulnerability
    22Monitor
  • Later →CVE-2026-26186Feb 25, 2026 · Fleet has a SQL injection via backtick escape in ORDER BY parameter
    20Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Go:github.com/fleetdm/fleet4.75.2Package registry (OSV)
Go:github.com/fleetdm/fleet4.76.2Package registry (OSV)
Go:github.com/fleetdm/fleet4.77.1Package registry (OSV)
Go:github.com/fleetdm/fleet4.78.3Package registry (OSV)
Go:github.com/fleetdm/fleet/v44.75.2Package registry (OSV)
Go:github.com/fleetdm/fleet/v44.76.2Package registry (OSV)
Go:github.com/fleetdm/fleet/v44.77.1Package registry (OSV)
Go:github.com/fleetdm/fleet/v44.78.3Package registry (OSV)
Go:github.com/fleetdm/fleet/v44.78.3-0.20260112221730-5c030e32a3a9Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-101047249 days apartFleet before 4.87.0 Unauthenticated iOS App Download via Predictable URLs
    27Monitor
  • CVE-2026-2918065 days apartFleet's team maintainer can transfer hosts from any team via missing source team authorization
    19Monitor
  • CVE-2026-2400435 days apartFleet: Unauthenticated Android device disenrollment vulnerability via Pub/Sub endpoint
    6Monitor

Not on record for this CVE: EPSS history · researcher credit · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-862 · Missing Authorization

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records