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CVE-2026-82989 – Unauthenticated Input Injection – ViewSonic vCast v0.0.0–v3.2.715

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Summary

CVE-2026-82989 is a critical, unauthenticated input-injection vulnerability in ViewSonic’s vCast media-casting service, the wireless collaboration software bundled with Android-based ViewBoard interactive smartboards. The flaw allows a remote, unauthenticated attacker on the local network to inject arbitrary input into exposed vCast service endpoints via crafted HTTP requests, with no user interaction required. It carries a CVSS v3.1 base score of 9.8 (Critical) and is one of three chained vCast vulnerabilities (alongside CVE-2026-82987 and CVE-2026-82988) tracked by CERT/CC as VU#234131, which together can allow full compromise of an affected device.

Technical details

  • Root cause: vCast exposes network service endpoints that fail to validate or neutralize attacker-supplied input before processing it (CWE-147: Improper Neutralization of Input During Web Page Generation; CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component).
  • Trigger conditions: The vulnerable endpoints require no authentication — any device able to reach the vCast service over the network can send specially crafted HTTP requests to inject input/commands.
  • Attack vector: Network-based (AV:N); no privileges and no user interaction are required. Public technical write-ups describe this behavior as part of an unauthenticated control interface that accepts direct device actions (e.g., key-event/input injection) without any handshake or cryptographic verification.
  • Impact: Successful exploitation can allow an attacker to manipulate device behavior and, when chained with the related vCast flaws (unauthenticated screen-content capture and unauthenticated APK installation), achieve full device compromise, unauthorized access to displayed content, persistent installation of attacker-supplied applications, and a potential foothold for lateral movement on the connected network.

Affected software

  • ViewSonic vCast, versions v0.0.0 through v3.2.715 (software bundled with Android-based ViewSonic ViewBoard interactive smartboard displays).

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: As of publication, ViewSonic’s remediation status for this issue is listed as "Unknown" by CERT/CC, which reported being unable to reach the vendor during coordinated disclosure — no patched vCast version is currently confirmed available. Organizations should monitor ViewSonic channels for a firmware/software update addressing vCast and apply it as soon as it is released.
  • If no patch is available:
    • Isolate ViewBoard/vCast devices on a dedicated, segmented network separate from systems holding sensitive data.
    • Restrict network access to the vCast service (HTTP and control-socket ports) to trusted hosts only, blocking access from untrusted or guest network segments.
    • Disable vCast/wireless casting functionality on affected displays where it is not required for business operations.
    • Monitor network traffic to and from ViewBoard/vCast devices for unexpected or suspicious connections and commands.

References

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