EUVD-2026-77234
GHSA-jww6-h856-xhj9
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-delivered XSS requiring victim interaction (UI:R), scope changes to browser (S:C), low confidentiality and integrity impact; no device-level impact.
Primary rating from Vendor (jpcert).
CVSS VectorVendor: jpcert
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Cross-site scripting in CONTEC's CONPROSYS nano Series industrial remote I/O coupler units allows an unauthenticated attacker to execute arbitrary JavaScript in the web browser of a logged-in operator. The affected products are OT/ICS edge devices (CPSN-MCB271, CPSN-EOB471EI, CPSN-PCB271-S1-041) used in industrial automation environments where their web management interfaces are the attack surface. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a user who is already logged into the CONPROSYS nano Series web management interface to actively interact with attacker-controlled content (e.g., click a crafted link or load a malicious page), as mandated by UI:A in the CVSS 4.0 vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.1 (Medium) reflects a realistic assessment of this vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Consult the CONTEC security advisory (contec_security_cps_26091000_en.pdf, linked from the vendor security portal) and the JVN advisory JVNVU96551518 for vendor-released patch details, as specific fixed firmware versions are not confirmed in the available intelligence data. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Credential disclosure in Contec's Remote I/O Coupler Unit (Server Type) CPSN-MCB271 enables an attacker who obtains a de
Unauthenticated REST API access on Contec's CPSN-MCB271 series Remote I/O Coupler Unit (Server Type) allows any network-
Stack-based buffer overflow in Contec Remote I/O Coupler Unit (Server Type) CPSN-MCB271-* allows an authenticated remote
Out-of-bounds write in CONPROSYS nano Series Remote I/O Coupler Units from Contec Co., Ltd. enables remote attackers wit
Cross-site request forgery affects a broad range of Contec industrial data loggers, flow computers, and remote I/O coupl
Plaintext credential storage in CONTEC's CONPROSYS nano Series industrial remote I/O devices exposes passwords to attack
Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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