Analyst readout for executives and security teams
Plain-English summary
S2OPC 1.5.0 may wrongly trust a well-formed certificate that is not actually in the trusted list. That can weaken authentication decisions and create risk to confidentiality, integrity, and availability where S2OPC protects network-accessible services.
Executive priority
Treat this as a high-priority dependency validation issue for affected systems. The issue can undermine certificate trust, but current public sources do not show known exploitation or a named patch version.
Technical view
CVE-2026-9758 is CWE-295 improper certificate validation in Systerel S2OPC 1.5.0. The CVE says an improper comparison against the trusted certificate list can cause an untrusted certificate to be considered trusted. CVSS 3.1 is 7.3 with network attack vector, low complexity, no privileges, and no user interaction.
Likely exposure
Exposure is limited to environments running Systerel S2OPC version 1.5.0 in certificate-authenticated paths. The CVE record lists default status as unaffected outside the named affected version, but administrators should confirm deployed package versions and vendor guidance.
Exploitation context
The source bundle does not report active exploitation, and the CVE is not listed as KEV. The CVSS vector indicates remote, unauthenticated attack potential if an attacker can reach the affected service and trigger certificate validation with a well-formed untrusted certificate.
Researcher notes
Public detail is sparse. Focus review on certificate trusted-list comparison behavior in S2OPC 1.5.0 and whether reachable services rely on that decision for authentication or session establishment. Avoid assuming broader version impact without vendor confirmation.
Mitigation direction
- Check Systerel guidance and the referenced work item for fixed versions or official mitigation.
- Upgrade S2OPC 1.5.0 when a vendor-supported fixed release is identified.
- Restrict network access to systems using affected S2OPC certificate validation paths.
- Review certificate trust lists for stale, unexpected, or overly broad trust entries.
- Increase monitoring for failed or unusual certificate-based authentication attempts.
Validation and detection
- Inventory applications and services embedding or deploying S2OPC.
- Confirm whether any deployed component is S2OPC version 1.5.0.
- Review dependency manifests, container images, and build artifacts for bundled S2OPC.
- Map where S2OPC handles certificate-based trust decisions.
- Check vendor advisories before declaring remediation complete.
Public sources used
Based on public source material and reviewed before publication.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-295: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-9758 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L 3.9 3.4 GitLab Vulnerability scoring details
Base CVSS 3.1 score
7.3 HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reserved CVE Program
The CVE ID was reserved by the assigning CNA.
- CVE published CVE Program
The CVE record was published.
- CVE updated CVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 source CVE List V5
- https://gitlab.com/systerel/S2OPC/-/work_items/1770 CVE reference, GitLab
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Certificate Validation
Improper Certificate Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.