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CVE-2026-18257— 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.

Systerel S2OPC是Systerel公司的中间件-消息队列。 Systerel S2OPC 1.5.0版本至2.0.0之前版本存在加密问题漏洞，该漏洞源于对根颁发者证书的有效性检查不当，可能导致证书被错误信任。

CVSS 5.6 · Medium EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
Systerel S2OPC 1.5.0< 2.0.0 affected
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I. Basic Information for CVE-2026-18257

Vulnerability Information
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Vulnerability Title
Improper Certificate Validation in S2OPC
Source: CVE Program / CVE List V5
Vulnerability Description
Improper validity period check for root issuer certificate in CycloneCrypto cryptographic wrapper of S2OPC allows a certificate issued by this root issuer to be considered trusted
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/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
Systerel S2OPC 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Systerel S2OPC是Systerel公司的中间件-消息队列。 Systerel S2OPC 1.5.0版本至2.0.0之前版本存在加密问题漏洞，该漏洞源于对根颁发者证书的有效性检查不当，可能导致证书被错误信任。
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 ~ 2.0.0 -

II. Public POCs for CVE-2026-18257

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-18257

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Other References for CVE-2026-18257 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-18257

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