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CVE-2026-55730 – Reflected XSS – Loytec LWEB-802 before 5.0.8

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Summary

CVE-2026-55730 is a reflected Cross-Site Scripting (XSS) vulnerability (CWE-79) in Loytec LWEB-802, a web-based building automation visualization platform, affecting all versions prior to 5.0.8 on all platforms. An unauthenticated remote attacker can inject and execute arbitrary JavaScript in a victim’s browser by tricking them into clicking a crafted link that contains a malicious project or mspParams URL parameter. The vulnerability carries a CVSS 4.0 score of 8.7 (HIGH), with rated high impact on confidentiality, integrity, and availability.

Technical details

  • Root cause: Improper neutralization of user-supplied input during web page generation (CWE-79); the project and mspParams URL parameters are reflected into the HTTP response without adequate sanitization or output encoding.
  • Trigger conditions: A victim must click a crafted link targeting an exposed LWEB-802 instance; no authentication or special privileges are required on the part of the attacker.
  • Attack vector: Network — the attack is delivered over standard HTTP/HTTPS to any publicly or network-accessible LWEB-802 instance.
  • Impact: Arbitrary attacker-supplied JavaScript executes within the victim’s browser session, enabling session hijacking, credential theft, and unauthorized actions performed with the victim’s privileges.

Affected software

  • Loytec LWEB-802 — all versions prior to 5.0.8 (all platforms)

Severity

CVSS 4.0 base score: 8.7 (HIGH)
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Update Loytec LWEB-802 to version 5.0.8 or later, as directed in the vendor’s security advisory.
  • Network mitigation: Restrict internet-facing access to LWEB-802 instances to authorized personnel only; consider placing the management interface behind a VPN or firewall to reduce exposure while patching is being applied.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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