Home / Vulnerabilities / CVE-2021-26829
MEDIUM SEVERITY
CVE-2021-26829 OpenPLC · ScadaBR

OpenPLC ScadaBR Cross-site Scripting Vulnerability

Technical Severity

CVSS v3.1 Metrics

MEDIUM
5.4 / 10
Minimal Risk Critical
Vector Specification
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Exploitation Likelihood

EPSS Prediction

13.57 %
Predictive Probability
Percentile Rank
94.0 th

Documented as more likely to be exploited than 94.0% of known CVEs.

Detection Date

Nov 28, 2025

Remediation Due

Dec 19, 2025

CISA Catalog Active

Threat Analysis

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

Remediation Directive

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

External Intelligence

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
NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2021-26829