What is CVE-2026-28205?

CVE-2026-28205 is a critical-severity vulnerability in Openplcproject Openplc V3, classified under Initialization of a Resource with an Insecure Default. CVSS score: 9.8/10. Published 2026-04-09.

How severe is CVE-2026-28205?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Openplcproject Openplc V3

CVE-2026-28205

OpenPLC_V3 is vulnerable to an Initialization of a Resource with an Insecure Default vulnerability which could allow an attacker to gain access to the system by bypassing authentication via an API.

Published 2026-04-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 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.

EPSS exploit prediction

EPSS: 0.007 (51.1th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.1% 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: 0.007 · change: +0.002

Affected products

Weakness classification (CWE)

CWE-1188 — Initialization of a Resource with an Insecure Default

References

www.cisa.gov/news-events/ics-advisories/icsa-25-345-10 (US Government Resource, Third Party Advisory, government-resource)

Frequently asked questions

What is CVE-2026-28205?: CVE-2026-28205 is a critical-severity vulnerability in Openplcproject Openplc V3, classified under Initialization of a Resource with an Insecure Default. CVSS score: 9.8/10. Published 2026-04-09.
How severe is CVE-2026-28205?: Critical severity. CVSS v3 base score is 9.8 out of 10.