Vulnerability in Systerel S2opc

CVE-2026-9758

Improper comparison with the certificates trusted list in S2OPC allows an attacker well-formed untrusted certificate to be considered trusted

Vulnerability class: Improper Certificate Validation

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.001 (1.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-9758: held from 0.002 to 0.001.

EPSS over last 30 days · oldest: 0.002 · newest: 0.001 · change: -0.001

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-9758?
CVE-2026-9758 is a high-severity vulnerability in Systerel S2opc, classified under Improper Certificate Validation. CVSS score: 7.3/10. Published 2026-06-10.
How severe is CVE-2026-9758?
High severity. CVSS v3 base score is 7.3 out of 10.