Auth bypass in Gardyn Cloud API
CVE-2026-28766
A specific endpoint exposes all user account information for registered Gardyn users without requiring authentication.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.006 (46.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Gardyn Cloud API — versions 0
- Mygardyn Cloud API
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.cisa.gov/news-events/ics-advisories/icsa-26-055-03 (US Government Resource, Third Party Advisory)
- mygardyn.com/security/ (Vendor Advisory)
- github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-055-03.js… (Third Party Advisory)
Frequently asked questions
- What is CVE-2026-28766?
- CVE-2026-28766 is a critical-severity vulnerability in Gardyn Cloud API, classified under Missing Authentication for Critical Function. CVSS score: 9.3/10. Published 2026-04-03.
- How severe is CVE-2026-28766?
- Critical severity. CVSS v3 base score is 9.3 out of 10.
- Is CVE-2026-28766 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.