# CVE-2026-82787: Contec CONPROSYS IO-Link Master missing authentication for critical function

Source: https://junglewise.ai/threats/cve-2026-82787-contec-conprosys-io-link-master-missing-authentication-for  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-14. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-82787 · Severity: critical · CVSS 9.8 · Published 2026-09-14

The Contec CONPROSYS IO-Link Master (model CPSL-08P1EN) is an industrial device used to manage input/output data in manufacturing and automation environments. A missing authentication vulnerability allows remote attackers to execute REST API calls without logging in, potentially retrieving sensitive I/O values or controlling critical outputs without authorization.

Vendors: [Contec](https://junglewise.ai/threats/vendors/contec).

## Quick answers

**Is CVE-2026-82787 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82787 being exploited in the wild.

**How severe is CVE-2026-82787?** Critical severity, with a CVSS score of 9.8, published 14 September 2026.

**Which products and versions are affected?** Contec CONPROSYS IO-Link Master CPSL-08P1EN prior to 2.3.10.

**Is there a fix for CVE-2026-82787?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-82787 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-82787?** Check whether you run Contec CONPROSYS IO-Link Master CPSL-08P1EN at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This is a missing authentication vulnerability (CWE-306) in the REST API of the CONPROSYS IO-Link Master CPSL-08P1EN versions prior to 2.3.10. The vulnerability allows unauthenticated network-based access to critical API endpoints that control and monitor industrial I/O operations. An attacker without credentials can interact with the REST API to read I/O values and manipulate output states, potentially disrupting industrial processes. The vulnerability requires no user interaction and is remotely exploitable over the network. Patches are available in version 2.3.10 and later.

## Affected products

- Contec CONPROSYS IO-Link Master CPSL-08P1EN prior to 2.3.10

## Timeline

- 2026-09-14: disclosed
- 2026-09-10: advisory: JVNVU#96551518 published

## References

- [https://jvn.jp/en/vu/JVNVU96551518/](https://jvn.jp/en/vu/JVNVU96551518/)
- [https://www.contec.com/api/downloadlogger?download=/-/media/Contec/support/security-info/2026/contec_security_cps_26091000_en.pdf](https://www.contec.com/api/downloadlogger?download=/-/media/Contec/support/security-info/2026/contec_security_cps_26091000_en.pdf)

## Related threats

- [Contec CONPROSYS IO-Link Master cross-site scripting](https://junglewise.ai/threats/cve-2026-82788-contec-conprosys-io-link-master-cross-site-scripting)