Critical

Unauthenticated user account information exposure in Gardyn Cloud API

IdentifiersCVE-2026-28766CWE-306· Missing Authentication for…

CVE-2026-28766 is an authentication bypass / missing authentication vulnerability in the Gardyn Cloud API affecting versions prior to 2.12.2026. A specific user-facing endpoint returns all registered Gardyn user account information without requiring authentication. The issue is classified as CWE-306 (Missing Authentication for Critical Function). Based on the provided CVSS vectors and advisory context, the flaw is remotely exploitable over the network, requires no privileges, and does not require user interaction. The vulnerability results in unauthorized exposure of sensitive cloud-side user account data and may also permit limited integrity impact.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

A remote unauthenticated attacker can retrieve all user account information for registered Gardyn users from the vulnerable endpoint. The provided CVSS vectors indicate high confidentiality impact, low integrity impact, and no direct availability impact. In the broader advisory context, exposure of sensitive cloud data may facilitate follow-on activity, including targeting of users and potential lateral movement within the Gardyn cloud environment.

Mitigation

If you can’t patch tonight, do this now.

If immediate remediation is not possible, restrict exposure of the affected API endpoints to trusted networks and administrative paths only, place the service behind appropriate access controls, and monitor for unauthenticated requests to user-data endpoints. Consistent with CISA guidance for the affected Gardyn environment, minimize network exposure, avoid direct public internet accessibility where possible, place systems behind firewalls, and use secure remote-access mechanisms such as fully updated VPN solutions when remote access is required.

Remediation

Patch, then assume compromise.

Upgrade the Gardyn Cloud API to version 2.12.2026 or later. Apply the vendor fixes referenced by CISA advisory ICSA-26-055-03 and Gardyn's security guidance. The vulnerable endpoint should enforce authentication and authorization checks before returning any user account data, and access to bulk user information should be restricted to explicitly authorized roles only.

PUBLIC EXPLOITS

Exploits

No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.

VALID 0 / 2 TOTALView more in app

All candidate exploits were filtered out by Mallory's validation.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

MygardynCloud Apiapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

6 SOURCESView more in app

cyber security newsNews

Apr 21, 2026

Critical Gardyn Smart Gardens Vulnerabilities Let Attackers Control Devices Remotely

A recently added vulnerability affecting Gardyn Cloud API versions prior to 2.12.2026 as part of a broader set of critical flaws in the Gardyn ecosystem.

cvefeed high severityNews

Apr 3, 2026

CVE-2026-28766 - Gardyn Cloud API Missing Authentication for Critical Function

An improper authentication vulnerability in a Gardyn endpoint that exposes all registered user account information without requiring authentication.

What this page doesn’t show

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity4