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PatchSiren cyber security CVE debrief

CVE-2026-28766 Gardyn CVE debrief

CVE-2026-28766 is a critical authentication failure in Gardyn Home Kit-related products where a specific endpoint exposes registered user account information without requiring authentication. CISA rates the issue CVSS 3.1 9.3 (network-reachable, no privileges, no user interaction), with the main impact on confidentiality.

Vendor
Gardyn
Product
<master.619
CVSS
CRITICAL 9.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-02-24
Original CVE updated
2026-07-02
Advisory published
2026-02-24
Advisory updated
2026-07-02

Who should care

Gardyn users and anyone responsible for Gardyn-connected home or studio devices should treat this as urgent, especially if they rely on the Gardyn mobile app and cloud-connected services.

Technical summary

CISA’s CSAF advisory states that a specific endpoint can expose all user account information for registered Gardyn users without authentication. The advisory maps the issue to CWE-306 and lists affected products including Gardyn Home Firmware < master.619, Gardyn Studio Firmware, Gardyn Mobile Application < 2.11.0, and Gardyn Cloud API < 2.12.2026. The published CVSS vector is AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N, indicating a network-reachable issue with no auth barrier and high confidentiality impact.

Defensive priority

Immediate: apply vendor-recommended updates as soon as possible because the flaw allows unauthenticated access to user account data.

Recommended defensive actions

  • Update the Gardyn mobile application to the latest supported version.
  • Upgrade Gardyn Home and Gardyn Studio devices to firmware master.622 or later.
  • Ensure the devices have network connectivity so firmware updates can download automatically.
  • Check the current app and Home firmware versions in the Gardyn app.
  • If updates cannot be applied, contact Gardyn support and follow the published security guidance.

Evidence notes

This debrief is based on the CISA CSAF advisory ICSA-26-055-03 and its referenced official resources. The advisory description explicitly states that a specific endpoint exposes all user account information for registered Gardyn users without authentication. The advisory revision history shows initial publication on 2026-02-24 and Update A on 2026-04-02, which added CVE-2026-28766 and revised mitigations. Vendor attribution in the source is low-confidence and marked for review, so product naming should be treated carefully.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-28766 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-28766

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-28766 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-28766

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-055-03.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-26-055-03

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.