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Vulnerability record · CVE-2026-28766 · published 3 April 2026

CVE-2026-28766: Mygardyn cloud api missing authentication for critical function vulnerability

Mygardyn · Cloud Api

A specific endpoint exposes all user account information for registered Gardyn users without requiring authentication.

9.2 CVSS 4.0 Critical EPSS 0.60% · top 53.3% CWE-306 · Missing authentication for critical function
9.2CVSS 4.0 base score
0.60%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
24 Jul 2026Last modified by NVD

Description

A specific endpoint exposes all user account information for registered Gardyn users without requiring authentication.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-055-03.json Third Party Advisory
https://mygardyn.com/security/ Vendor Advisory
https://www.cisa.gov/news-events/ics-advisories/icsa-26-055-03 Third Party AdvisoryUS Government Resource

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.3CVE-2026-25197Mygardyn cloud api insecure direct object reference vulnerabilityA specific endpoint allows authenticated users to pivot to other user profiles by modifying the id number in the API call.EPSS 0.30%8.7CVE-2026-32646Mygardyn cloud api missing authentication for critical function vulnerabilityA specific administrative endpoint is accessible without proper authentication, exposing device management functions.EPSS 0.68%6.9CVE-2026-32662Mygardyn cloud api vulnerabilityDevelopment and test API endpoints are present that mirror production functionality.EPSS 0.44%6.9CVE-2026-28767Mygardyn cloud api missing authentication for critical function vulnerabilityA specific administrative endpoint notifications is accessible without proper authentication.EPSS 0.53%8.8CVE-2026-67277MikroTik RouterOS btest missing authentication leaks kernel memory and crashes kernelRouterOS accepts a "related" btest connection before the primary session is authenticated, letting an unauthenticated client start an IPv4 UDP test. …KEVEPSS 1.6%analysed8.8CVE-2026-59822LiteLLM MCP endpoint auth bypass via OAuth2 passthrough fallbackLiteLLM's MCP Streamable HTTP endpoint, prior to 1.84.0, let an unauthenticated attacker send a fabricated Authorization header that triggered an OAu…KEVEPSS 0.84%analysed9.3CVE-2026-72529TrueConf Server missing authentication allows remote script executionTrueConf Server versions 5.3.X through 5.3.9, 5.4.X through 5.4.9, 5.5.X through 5.5.5, and earlier expose an undocumented function on port 4307/TCP …KEVEPSS 1.5%analysed9.8CVE-2026-46817Oracle E-Business Suite Payments missing authentication allows takeoverOracle Payments in Oracle E-Business Suite 12.2.3 through 12.2.15 contains an easily exploitable flaw in the File Transmission component. An unauthen…KEVEPSS 0.81%analysed

Source: NIST National Vulnerability Database (record CVE-2026-28766), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.