Medium severity · published Sep 14, 2026
CVE-2026-82784
Missing authentication for critical function vulnerability exists in Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RI
Remote I/O Coupler Unit (Server Type) CPSN-MCB271-* · Contec Co., Ltd.
before 1.82 · source: vendor
Affected product
RI
Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*
Contec Co., Ltd.
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-82784
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-82784
jvn.jp
https://jvn.jp/en/vu/JVNVU96551518/
www.contec.com
https://www.contec.com/api/downloadlogger?download=/-/media/Contec/support/security-info/2026/contec_security_cps_26091000_en.pdf
More from Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*
6.3
CVE-2026-82786
Insufficiently protected credentials issue exists in Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*
5.4
CVE-2026-82781
Cross-site scripting vulnerability exists in CONPROSYS nano Series
4.3
CVE-2026-82785
Stack-based buffer overflow vulnerability exists in Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*
4.3
CVE-2026-82782
Out-of-bounds write vulnerability exists in CONPROSYS nano Series
4.3
CVE-2026-82764
Cross-site request forgery vulnerability exists in multiple Contec products