What is CVE-2026-35063?

CVE-2026-35063 is a high-severity vulnerability in Openplcproject Openplc V3, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-04-09.

How severe is CVE-2026-35063?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in Openplcproject Openplc V3

CVE-2026-35063

OpenPLC_V3 REST API endpoint checks for JWT presence but never verifies the caller's role. Any authenticated user with role=user can delete any other user, including administrators, by specifying their user ID or they can create new accounts with role=admin, escalating to full administrator access.

Vulnerability class: Broken Access Control

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (35.7th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002

Affected products

Weakness classification (CWE)

CWE-862 — Missing Authorization

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-2026-35063?: CVE-2026-35063 is a high-severity vulnerability in Openplcproject Openplc V3, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-04-09.
How severe is CVE-2026-35063?: High severity. CVSS v3 base score is 8.8 out of 10.