CVE-2026-9259Network attack vector

Credential disclosure via improper server certificate validation

Published Jun 15, 2026 · Updated Jun 15, 2026

Improper certificate validation in Canon EOS Network Setting Tool 1.5.0 and earlier allows man-in-the-middle attackers to obtain test credentials. The FTP/FTPS/SFTP communication test accepts an untrusted server certificate, but Canon has not disclosed which certificate check is defective. Exploitation requires a user to run the test while the attacker intercepts its server connection, exposing authentication information.

CVSS severity7.1
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Canon EOS Network Setting Tool 1.5.0 and earlier allows man-in-the-middle attackers to obtain test credentials. The FTP/FTPS/SFTP communication test accepts an untrusted server certificate, but Canon has not disclosed which certificate check is defective. Exploitation requires a user to run the test while the attacker intercepts its server connection, exposing authentication information.

The record

CVE
CVE-2026-9259
Published
Jun 15, 2026
Updated
Jun 15, 2026
Vendor
Canon Inc.
Product
EOS Network Setting Tool
Classifications
CWE-295, CAPEC-459, CAPEC-475, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=1.5.0 or earlier

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Canon Inc. · EOS Network Setting Toolversion=1.5.0 or earlier

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.1Canon Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
6.5Canon Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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-295Improper Certificate Validation
CAPEC-459Creating a Rogue Certification Authority Certificate
CAPEC-475Signature Spoofing by Improper Validation
T1557Adversary-in-the-Middle

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

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Your stack

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