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CVE-2026-78802 – Unauthenticated Remote Code Execution – SKYWORTH SK-WR6640X (AX1800M) firmware V1.0

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Summary

CVE-2026-78802 is a code injection vulnerability (CWE-94) in the SKYWORTH DIGITAL SK-WR6640X Wi-Fi 6 Dual-Band Fiber Router (AX1800M), firmware V1.0.3. A remote attacker can execute arbitrary code on the device. The CVE record rates it Critical (CVSS 9.8).

Technical details

  • Root cause: CWE-94, Improper Control of Generation of Code. The CVE record does not name the vulnerable function or parameter.
  • Trigger conditions: A third-party disclosure (PRISMI-Team, titled "unauthorized-rce") attributes the issue to hidden web endpoints that lack access controls. The CVE record’s vector requires no privileges and no user interaction.
  • Attack vector: Network. The CVE vector is AV:N/AC:L/PR:N/UI:N. The disclosure describes the attacker as network-adjacent, so whether the endpoints are reachable from the internet depends on how the device is exposed.
  • Impact: Arbitrary code execution, with high impact to confidentiality, integrity and availability. The disclosure describes possible outcomes including credential disclosure, activation of remote management services, and root-level access. No proof-of-concept code is included in the disclosure.

Affected software

  • SKYWORTH SK-WR6640X Wi-Fi 6 Dual-Band Fiber Router (AX1800M), firmware V1.0.3

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: No fixed firmware version has been identified in the sources reviewed. Check with SKYWORTH or your service provider for a firmware update.
  • If no patch is available:
    • Do not expose the router’s web management interface to the internet or to untrusted networks.
    • Restrict management access to trusted hosts, for example with firewall rules.
    • Monitor the device for unexpected configuration changes or remote management services being enabled.
    • Consider replacing the device if no fix is released.

References

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