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CVE-2026-82787 – Missing Authentication for Critical Function (Unauthenticated Remote Access) – Cont

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Summary

CVE-2026-82787 is a critical missing-authentication vulnerability affecting the Contec CPSL-08P1EN CONPROSYS IO-Link Master, an industrial IoT device used to configure and communicate with IO-Link sensors and actuators. The affected device exposes a critical function/interface without requiring authentication, allowing a remote, unauthenticated attacker to operate the device over the network. The issue carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: The device fails to enforce authentication (CWE-306: Missing Authentication for Critical Function) on a critical operational interface.
  • Trigger conditions: No authentication, prior access, or user interaction is required — an attacker only needs network reachability to the exposed interface.
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: Successful exploitation allows a remote attacker to operate the affected device without valid credentials, resulting in full compromise of confidentiality, integrity, and availability of the device and the industrial process/data it controls.
  • This CVE was disclosed as part of a broader set of vulnerabilities affecting multiple Contec CONPROSYS product lines (M2M Gateway, M2M Controller, PAC, TM, nano series, and CHS), reported via JPCERT/CC and published on JVN (JVNVU#96551518).

Affected software

  • Contec CPSL-08P1EN (CONPROSYS IO-Link Master) — firmware versions prior to 2.3.10

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • (CVSS v4.0 rating also published: 8.7, High)

Mitigation and recommended actions

  • Immediate: Upgrade the CPSL-08P1EN firmware to version 2.3.10 or later, as specified by Contec.
  • Network mitigation: Until patched, ensure the device’s management/API interfaces are not exposed to untrusted networks or the public internet; restrict access to the device to trusted management segments only (e.g., via network segmentation, firewall rules, or VPN).
  • General hardening: Review Contec’s consolidated advisory for the CONPROSYS series, as other related CVEs (command injection, file upload, XSS, eval injection) affect sibling product lines and may require additional firmware updates across the deployed fleet.

References

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