CVE-2026-82784 Missing authorization in Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*
Attackers can access REST APIs without authentication to read I/O values or control outputs on Contec Remote I/O Coupler Units.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-82784?
CVE-2026-82784 is a medium-severity missing authorization vulnerability in Contec Co., Ltd. Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Missing authentication for critical function vulnerability exists in Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*. An attacker may execute a REST API without authentication, which could allow the attacker to retrieve I/O values and/or control the output.
Weakness: CWE-306
Which versions are affected by CVE-2026-82784?
How do I fix CVE-2026-82784?
No fix has been published for CVE-2026-82784 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-82784 being exploited?
There is no known exploitation of CVE-2026-82784 in the wild and no public exploit code.
Sources
Also known as GHSA-5w7g-j8f5-2795.