8.1

CVE-2026-23517: fleetdm fleet Missing Authorization

CVSS: 8.1v3.1HighAnalyzed
AliasesGHSA-4r5r-ccr6-q6f6GO-2026-4334
Published 21-01-2026Last modified 22-01-2026
Open JSON

Vulnerability summary

CVE-2026-23517 is a high (CVSS 8.1) Missing Authorization vulnerability in fleetdm fleet. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 20.4% of scored vulnerabilities.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (NVD)
EPSS score
0.29%
0%100%
Low · +0.01 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

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

+0.01 pp

From 0.29% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.29%

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, < 4.78.3 | 4.77.0
Github.com/fleetdm1 product
  • 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
Github.com/fleetdm/fleet1 product
  • v4< 4.78.3-0.20260112221730-5c030e32a3a9 | ≥ 4.78.0, < 4.78.3

3 vendors · 3 products

References

5 links