CVE-2021-26829

MEDIUM5.4

CISA KEV

Published 2021-06-11 · Updated 2026-06-17 · Source cve@mitre.org

Summary

CVE-2021-26829 is a medium-severity (CVSS 5.4) vulnerability in OpenPLC ScadaBR. CISA added it to the Known Exploited Vulnerabilities catalog on November 28, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by December 19, 2025. CISA does not currently list it as used in ransomware campaigns. OpenPLC has 2 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 2 known-exploited OpenPLC vulnerabilities →

Description

OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored XSS via system_settings.shtm.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CWE-79CWE-79

CISA Known-Exploited Vulnerability

Product: OpenPLC — ScadaBR

Name: OpenPLC ScadaBR Cross-site Scripting Vulnerability

Date added: 2025-11-28 · Due: 2025-12-19

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.

References

View on NVD

More exploited OpenPLC vulnerabilities

Most recently added to CISA KEV

CVE-2021-26828
ScadaBR — OpenPLC ScadaBR Unrestricted Upload of File with Dangerous Type Vulnerability
added 2025-12-03

View all →

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