# CVE-2026-82788: Contec CONPROSYS IO-Link Master cross-site scripting

Source: https://junglewise.ai/threats/cve-2026-82788-contec-conprosys-io-link-master-cross-site-scripting  
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-2026-82788 · Severity: medium · CVSS 6.1 · Published 2026-09-14

The Contec CONPROSYS IO-Link Master (CPSL-08P1EN) is an industrial device used to manage IO-Link communications in manufacturing and automation environments. A cross-site scripting vulnerability allows attackers to inject malicious scripts that execute in the web browsers of logged-in users, potentially leading to session hijacking, credential theft, or unauthorized control of the device's operations.

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

## Quick answers

**Is CVE-2026-82788 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82788 being exploited in the wild.

**How severe is CVE-2026-82788?** Medium severity, with a CVSS score of 6.1, 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-2026-82788?** 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-2026-82788 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-82788?** 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 cross-site scripting (XSS) vulnerability (CWE-79) in the web interface of CPSL-08P1EN versions prior to 2.3.10. The vulnerability requires user interaction (a logged-in user must visit a malicious page), and the attack vector is network-based with no authentication required from the attacker's perspective. An attacker can craft a malicious URL or web page that, when visited by an authenticated user, executes arbitrary JavaScript in their browser context, potentially compromising the user's session, stealing credentials, or performing unauthorized actions on the device. The fix is available in version 2.3.10 and later.

## Affected products

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

## Timeline

- 2026-09-10: disclosed
- 2026-09-14: advisory

## 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 missing authentication for critical function](https://junglewise.ai/threats/cve-2026-82787-contec-conprosys-io-link-master-missing-authentication-for)