TI-2026-50895 Aliases CVE-2026-72657 GHSA-4ppv-hgww-58v5

Authorization Bypass Through User-Controlled Key in Fleet Server Leading to Information Disclosure

LOW 29CWE-639Published 2026-08-13 · Updated 2026-08-13

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

Authorization Bypass Through User-Controlled Key (CWE-639) in Fleet Server can lead to information disclosure via Manipulating User-Controlled Variables (CAPEC-77). The authorization decision for artifact downloads relied on a client-supplied value that was persisted without being validated against the server-side record of the requesting agent's assignment. An authenticated party in possession of a valid enrolled agent credential could therefore retrieve a policy the agent is not assigned to.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00385 32nd percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Elastic	Fleet Server	8.3.0 – 8.19.19; 9.0.0 – 9.4.4; 9.5.0	—	No fix listed	CNA

Fleet Server VendorElastic Affected 8.3.0 – 8.19.19; 9.0.0 – 9.4.4; 9.5.0 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:elastic:fleet_server::::::::	8.3.0 to before 8.19.20; 9.0.0 to before 9.4.5	Vulnerable	Elastic
cpe:2.3:a:elastic:fleet_server:9.5.0:::::::*	9.5.0	Vulnerable	Elastic

cpe:2.3:a:elastic:fleet_server:*:*:*:*:*:*:*:* Versions 8.3.0 to before 8.19.20; 9.0.0 to before 9.4.5 Vulnerable ·Elastic
cpe:2.3:a:elastic:fleet_server:9.5.0:*:*:*:*:*:*:* Versions 9.5.0 Vulnerable ·Elastic

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-72657
2026-10-03 Alias added: GHSA-4ppv-hgww-58v5

References

Advisory 1

https://discuss.elastic.co/t/fleet-server-8-19-20-9-4-5-9-5-1-security-update-esa-2026-112/389509

TI-2023-25169 Fleet Server Insertion of Sensitive Information into Log File CVSS 3.1HIGH 8.1
TI-2026-40526 Allocation of Resources Without Limits or Throttling in Fleet Server Leading to Denial of Service CVSS 3.1HIGH 7.5
TI-2026-54637 Incorrect Authorization in Fleet Server Leading to Denial of Service of Agent Upload Operations CVSS 3.1LOW 3.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences