CVE-2026-9259: CWE-295 Improper certificate validation in Canon Inc. EOS Network Setting Tool for Windows
CVE-2026-9259 is a high-severity vulnerability in Canon Inc.'s EOS Network Setting Tool for Windows, version 1.5.0 or earlier. It involves improper validation of server certificates, which could allow an attacker to intercept or manipulate network communications. The vulnerability has a CVSS 4.0 base score of 7.1, indicating a significant risk. No official patch or remediation guidance has been provided by the vendor as of the publication date. There are no known exploits in the wild at this time.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-9259) concerns improper validation of server certificates in Canon EOS Network Setting Tool for Windows, version 1.5.0 or earlier. The weakness is classified under CWE-295, indicating that the software does not correctly verify the authenticity of server certificates during network communication. This flaw could potentially allow an attacker to perform man-in-the-middle attacks or intercept sensitive data. The CVSS 4.0 score of 7.1 reflects a high impact with network attack vector, low attack complexity, no privileges required, and high vulnerability confidence. No remediation level or patch information is currently available from Canon.
Potential Impact
The improper certificate validation can lead to interception or manipulation of network traffic between the EOS Network Setting Tool and its servers. This could compromise confidentiality and integrity of data transmitted by the tool. Since no privileges are required and user interaction is needed, the risk is significant but exploitation requires user action. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should exercise caution when using the EOS Network Setting Tool, especially on untrusted networks. Avoid connecting the tool to unknown or untrusted servers to reduce risk.
CVE-2026-9259: CWE-295 Improper certificate validation in Canon Inc. EOS Network Setting Tool for Windows
Description
CVE-2026-9259 is a high-severity vulnerability in Canon Inc.'s EOS Network Setting Tool for Windows, version 1.5.0 or earlier. It involves improper validation of server certificates, which could allow an attacker to intercept or manipulate network communications. The vulnerability has a CVSS 4.0 base score of 7.1, indicating a significant risk. No official patch or remediation guidance has been provided by the vendor as of the publication date. There are no known exploits in the wild at this time.
CVSS v4.0
Score 7.1high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-9259) concerns improper validation of server certificates in Canon EOS Network Setting Tool for Windows, version 1.5.0 or earlier. The weakness is classified under CWE-295, indicating that the software does not correctly verify the authenticity of server certificates during network communication. This flaw could potentially allow an attacker to perform man-in-the-middle attacks or intercept sensitive data. The CVSS 4.0 score of 7.1 reflects a high impact with network attack vector, low attack complexity, no privileges required, and high vulnerability confidence. No remediation level or patch information is currently available from Canon.
Potential Impact
The improper certificate validation can lead to interception or manipulation of network traffic between the EOS Network Setting Tool and its servers. This could compromise confidentiality and integrity of data transmitted by the tool. Since no privileges are required and user interaction is needed, the risk is significant but exploitation requires user action. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should exercise caution when using the EOS Network Setting Tool, especially on untrusted networks. Avoid connecting the tool to unknown or untrusted servers to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Canon
- Date Reserved
- 2026-05-21T23:14:50.204Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3092290b89be6888c14f5b
Added to database: 6/16/2026, 12:00:41 AM
Last enriched: 6/16/2026, 12:15:42 AM
Last updated: 6/16/2026, 1:14:22 AM
Views: 4
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