EUVD-2026-77226
GHSA-vp8h-949q-v4xc
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-reachable XSS requiring victim interaction (UI:R); scope changes to browser (S:C); low C/I impact on browser session only; no device availability impact.
Primary rating from Vendor (jpcert).
CVSS VectorVendor: jpcert
Lifecycle Timeline
3DescriptionCVE.org
Cross-site scripting vulnerability exists in CONPROSYS M2M Gateway Series and CONPROSYS M2M Controller 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 the embedded web management interface of Contec CONPROSYS M2M Gateway and Controller Series devices (CPS-MG341, CPS-MGS341, CPS-MC341, CPS-MCS341) enables unauthenticated network attackers to inject arbitrary JavaScript that executes in the browser of a logged-in operator or administrator. The CVSS 4.0 vector scores 5.1 and confirms impact is entirely browser-side (SC:L/SI:L; VC:N/VI:N/VA:N), meaning the device itself is not directly compromised. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a logged-in user to actively interact with a page or input containing the attacker-injected XSS payload through the CONPROSYS embedded web management interface - the vendor advisory explicitly states impact is on 'a logged-in user's web browser.' The victim must hold an active authenticated session to the device web UI at the time of exploitation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.1 accurately reflects a moderate, browser-scoped impact: VC:N/VI:N/VA:N confirms the vulnerable device itself is unaffected, while SC:L/SI:L indicates the attacker gains only limited subsequent-system access (victim browser context). … 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 | Patch available per vendor advisory - consult the Contec security advisory (contec_security_cps_26091000_en.pdf) and JVNVU96551518 for exact patched firmware versions and upgrade procedures, as specific version numbers are not extractable from the available CPE data. … Detailed patch versions, workarounds, and compensating controls in full report. |
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OS command injection in CONPROSYS M2M Gateway and M2M Controller Series (CONTEC Co., Ltd.) allows an authenticated attac
Directory listing exposure in Contec's CONPROSYS M2M Gateway and M2M Controller Series allows a remote attacker to enume
Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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