CVE Watch—

CVE-2021-26829

OpenPLC ScadaBR Cross-site Scripting Vulnerability

CVSS

—

No CVSS

EPSS

48.0%

p99

KEV

YES

Nov 28, 2025

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

48.0%EPSS · 30 days48.0%

2026-06-302026-07-16

KEV catalog record

Product

OpenPLC / ScadaBR

Vulnerability

OpenPLC ScadaBR Cross-site Scripting Vulnerability

Added to KEV

Nov 28, 2025

Remediate by

Dec 19, 2025

Known ransomware use

Summary description

OpenPLC ScadaBR contains a cross-site scripting vulnerability via system_settings.shtm.

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Notes

This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/SCADA-LTS/Scada-LTS/pull/3211 ; https://nvd.nist.gov/vuln/detail/CVE-2021-26829

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CVE-2021-26828—

98.4%

KEV—80OpenPLC ScadaBR Unrestricted Upload of File with Dangerous Type Vulnerability—