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CVE-2026-82781

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-16
• Weakness: CWE-79

Description

Cross-site scripting vulnerability exists in CONPROSYS nano Series. If this vulnerability is exploited, an arbitrary script may be executed on a logged-in user's web browser.

Affected products

• Contec Co., Ltd. Programmable Remote I/O Coupler Unit (Software PLC Type) CPSN-PCB271-S1-041: before 1.61 — fixed in 1.61
• Contec Co., Ltd. Remote I/O Coupler Unit (EtherNet/IP Adapter) CPSN-EOB471EI-[]1: before 1.02 — fixed in 1.02
• Contec Co., Ltd. Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*: before 1.82 — fixed in 1.82

How to fix

Upgrade to a fixed version: Contec Co., Ltd. Programmable Remote I/O Coupler Unit (Software PLC Type) CPSN-PCB271-S1-041 1.61; Contec Co., Ltd. Remote I/O Coupler Unit (EtherNet/IP Adapter) CPSN-EOB471EI-[]1 1.02; Contec Co., Ltd. Remote I/O Coupler Unit (Server Type) CPSN-MCB271-* 1.82. Check the vendor advisory for mitigations.

References

• 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

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