EUVD-2026-77242
GHSA-7ppm-8hw3-5jvg
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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 needing authenticated attacker (PR:L) and victim interaction (UI:R); scope change to browser with low confidentiality and integrity impact only.
Primary rating from Vendor (jpcert).
CVSS VectorVendor: jpcert
Lifecycle Timeline
3DescriptionCVE.org
Cross-site scripting vulnerability exists in Contec FX5000 series, FX4000 series, and FX3000 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 FX5000, FX4000, and FX3000 series industrial data loggers allows a low-privileged authenticated attacker to inject arbitrary scripts that execute in a victim's web browser when viewing attacker-controlled content via the device web interface. The vulnerability was reported by JPCERT/CC and affects a broad range of OT/ICS field devices used in industrial monitoring and automation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) the attacker holds a valid low-privilege authenticated session on the Contec FX series device web management interface; (2) a second user (typically an administrator or operator) is actively logged in and browses to the page rendering the attacker's injected content. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 4.8 (Medium) is consistent with a stored or reflected XSS requiring both authentication and victim interaction, which substantially limits real-world exploitability. … 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 | Apply the firmware update referenced in the Contec security advisory (https://www.contec.com/api/downloadlogger?download=/-/media/Contec/support/security-info/2026/contec_security_fl_26091000_en.pdf). … Detailed patch versions, workarounds, and compensating controls in full report. |
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OS command injection in Contec FX5000, FX4000, and FX3000 series industrial data loggers and remote I/O units allows aut
Path traversal via FTP in Contec FX5000, FX4000, and FX3000 series industrial programmable controllers allows an authent
Cross-site request forgery affects a broad range of Contec industrial data loggers, flow computers, and remote I/O coupl
Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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