What’s Vulnerable › Vulnerabilities
CVE-2026-18257: Improper Certificate Validation in S2OPC
- Severity: medium (CVSS 5.6 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-29 · updated 2026-10-24
- Weakness: CWE-295
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
Affected products
- Systerel S2OPC: from 1.5.0 before 2.0.0 — fixed in 2.0.0
How to fix
Upgrade to a fixed version: Systerel S2OPC 2.0.0. Check the vendor advisory for mitigations.
References
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