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CVE-2026-9758— Improper Certificate Validation in S2OPC

Quick assessment

Affected
Systerel S2OPC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

S2OPC OPC UA Toolkit是Systerel开源的一个OPC UA通信开发工具包。 S2OPC OPC UA Toolkit存在信任管理问题漏洞，该漏洞源于与受信任证书列表比较不当，可能导致格式良好的不受信任证书被视为受信任。

CVSS 7.3 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Systerel S2OPC 1.5.0< 1.7.3 affected
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I. Basic Information for CVE-2026-9758

Vulnerability Information
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Vulnerability Title
Improper Certificate Validation in S2OPC
Source: CVE Program / CVE List V5
Vulnerability Description
Improper comparison with the certificates trusted list in S2OPC allows an attacker well-formed untrusted certificate to be considered trusted
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
S2OPC OPC UA Toolkit 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
S2OPC OPC UA Toolkit是Systerel开源的一个OPC UA通信开发工具包。 S2OPC OPC UA Toolkit存在信任管理问题漏洞，该漏洞源于与受信任证书列表比较不当，可能导致格式良好的不受信任证书被视为受信任。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Systerel S2OPC 1.5.0 ~ 1.7.3 -

II. Public POCs for CVE-2026-9758

# POC Description Source Link Shenlong Link
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No public POC found.

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III. Intelligence Information for CVE-2026-9758

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Vendor Advisories for CVE-2026-9758 (1)

IV. Related Vulnerabilities

Same product: S2OPC
Same vendor: Systerel
Same weakness: CWE-295