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Vulnerability record · CVE-2026-28205 · published 9 April 2026

CVE-2026-28205: Openplcproject openplc v3 firmware insecure default initialization vulnerability

Openplcproject · Openplc V3 Firmware

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.

9.2 CVSS 4.0 Critical EPSS 0.67% · top 50.0% CWE-1188 · Insecure default initialization
9.2CVSS 4.0 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H/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://www.cisa.gov/news-events/ics-advisories/icsa-25-345-10 Third Party AdvisoryUS Government Resource

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Related vulnerabilities

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

9.8CVE-2024-34026Openplcproject openplc v3 firmware stack-based buffer overflow vulnerabilityA stack-based buffer overflow vulnerability exists in the OpenPLC Runtime EtherNet/IP parser functionality of OpenPLC _v3 b4702061dc14d1024856f71b454…EPSS 2.4%9.8CVE-2018-20818Openplcproject openplc v2 firmware memory buffer overflow vulnerabilityA buffer overflow vulnerability was discovered in the OpenPLC controller, in the OpenPLC_v2 and OpenPLC_v3 versions. It occurs in the modbus.cpp mapU…EPSS 1.5%9.2CVE-2026-35556Openplcproject openplc v3 firmware vulnerabilityOpenPLC_V3 is vulnerable to a Plaintext Storage of a Password vulnerability that could allow an attacker to retrieve credentials and access sensitive…EPSS 0.40%8.8CVE-2021-31630Openplcproject openplc v3 firmware code injection vulnerabilityCommand Injection in Open PLC Webserver v3 allows remote attackers to execute arbitrary code via the "Hardware Layer Code Box" component on the "/har…EPSS 27%8.7CVE-2026-35063Openplcproject openplc v3 firmware missing authorization vulnerabilityOpenPLC_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…EPSS 0.43%7.5CVE-2024-36981Openplcproject openplc v3 firmware out-of-bounds read vulnerabilityAn out-of-bounds read vulnerability exists in the OpenPLC Runtime EtherNet/IP PCCC parser functionality of OpenPLC_v3 b4702061dc14d1024856f71b4543298…EPSS 1.0%7.5CVE-2024-39589Openplcproject openplc v3 firmware vulnerabilityMultiple invalid pointer dereference vulnerabilities exist in the OpenPLC Runtime EtherNet/IP parser functionality of OpenPLC_v3 16bf8bac1a36d95b73e7…EPSS 1.0%7.5CVE-2024-39590Openplcproject openplc v3 firmware vulnerabilityMultiple invalid pointer dereference vulnerabilities exist in the OpenPLC Runtime EtherNet/IP parser functionality of OpenPLC_v3 16bf8bac1a36d95b73e7…EPSS 1.0%

Source: NIST National Vulnerability Database (record CVE-2026-28205), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.