CVE-2026-8750Network attack vector

Unauthenticated file disclosure via unrestricted ImportFiles path

Published May 17, 2026 · Updated May 17, 2026

Improper access control in H2O.ai H2O-3 through build 7402 allows remote attackers to disclose server file information via ImportFiles. PersistNFS.importFiles converts the caller-controlled path into a local File and passes it to FileIntegrityChecker for traversal and key creation without adequate path authorization. An exposed, unauthenticated REST API is sufficient to enumerate information accessible to the H2O-3 process; no integrity or availability impact is reported.

CVSS severity5.3
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper access control in H2O.ai H2O-3 through build 7402 allows remote attackers to disclose server file information via ImportFiles. PersistNFS.importFiles converts the caller-controlled path into a local File and passes it to FileIntegrityChecker for traversal and key creation without adequate path authorization. An exposed, unauthenticated REST API is sufficient to enumerate information accessible to the H2O-3 process; no integrity or availability impact is reported.

The record

CVE
CVE-2026-8750
Published
May 17, 2026
Updated
May 17, 2026
Vendor
H2O.ai
Product
H2O-3
Classifications
CWE-200, CWE-284, T1083
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 17, 2026CVE publishedPublication date reported by the CVE source.
  2. May 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7402

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

H2O.ai · H2O-3version=7402

Published CVSS scores

5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0VulDBAV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-284Improper Access Control
T1083File and Directory Discovery

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo