CVE-2026-103264

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-10-01. A secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
9.1
EG Score
9.1CRITICALhigh confidence
EG Risk
56
EG Risk 56/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
22nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 1, 2026

Last Modified

October 1, 2026

Advisory Details (2)

Auto-updated Oct 1, 2026
Patch available. Sources: github.
generic

Fleet before 4.87.0 Authentication Bypass via Device Identifiers | Advisories | VulnCheck

https://www.vulncheck.com/advisories/fleet-before-4.87.0-authentication-bypass-via-device-identifiers
github Patch Available

Unauthenticated iOS/iPadOS device API access via non-secret host identifiers · Advisory · fleetdm/fleet · GitHub

https://github.com/fleetdm/fleet/security/advisories/GHSA-vrc8-2wcx-327f

Vendor Advisories for CVE-2026-103264(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 27× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 07:25 UTCGHSA enrichment
  2. 2026-10-04 03:28 UTCGHSA enrichment
  3. 2026-10-03 23:31 UTCGHSA enrichment
  4. 2026-10-03 19:35 UTCGHSA enrichment
  5. 2026-10-03 15:38 UTCEG score recompute
  6. 2026-10-03 15:38 UTCGHSA enrichment
  7. 2026-10-03 14:25 UTCEPSS rescore
  8. 2026-10-03 11:39 UTCGHSA enrichment
  9. 2026-10-03 07:41 UTCGHSA enrichment
  10. 2026-10-03 03:41 UTCGHSA enrichment
  11. 2026-10-02 23:41 UTCGHSA enrichment
  12. 2026-10-02 19:44 UTCEG score recompute
  13. 2026-10-02 19:44 UTCGHSA enrichment
  14. 2026-10-02 15:48 UTCGHSA enrichment
  15. 2026-10-02 11:51 UTCGHSA enrichment
  16. 2026-10-02 07:54 UTCGHSA enrichment
  17. 2026-10-02 03:58 UTCGHSA enrichment
  18. 2026-10-02 00:01 UTCGHSA enrichment
  19. 2026-10-01 19:09 UTCGHSA enrichment
  20. 2026-10-01 15:13 UTCGHSA enrichment
  21. 2026-10-01 14:21 UTCEG score recompute
  22. 2026-10-01 14:21 UTCGHSA enrichment
  23. 2026-10-01 13:41 UTCEG score recompute
  24. 2026-10-01 13:41 UTCGHSA enrichment
  25. 2026-10-01 11:27 UTCEG score recompute
Show 2 more
  1. 2026-10-01 10:51 UTCEG score recompute
  2. 2026-10-01 10:50 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-103264?
CVE-2026-103264 is a critical vulnerability published on October 1, 2026. 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…
When was CVE-2026-103264 disclosed?
CVE-2026-103264 was first published on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-103264 actively exploited?
CVE-2026-103264 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-103264?
CVE-2026-103264 has a CVSS base score of 9.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-103264?
A fix for CVE-2026-103264 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-103264 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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