What is CVE-2026-35556?

CVE-2026-35556 is a high-severity vulnerability in Openplcproject Openplc V3, classified under Plaintext Storage of a Password. CVSS score: 7.5/10. Published 2026-04-09.

How severe is CVE-2026-35556?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Openplcproject Openplc V3

CVE-2026-35556

OpenPLC_V3 is vulnerable to a Plaintext Storage of a Password vulnerability that could allow an attacker to retrieve credentials and access sensitive information.

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

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (33.2th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-256 — Plaintext Storage of a Password

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-2026-35556?: CVE-2026-35556 is a high-severity vulnerability in Openplcproject Openplc V3, classified under Plaintext Storage of a Password. CVSS score: 7.5/10. Published 2026-04-09.
How severe is CVE-2026-35556?: High severity. CVSS v3 base score is 7.5 out of 10.