November 28, 2025 · Applied Cybernetics Group
CVE-2021-26829 — OpenPLC ScadaBR
OpenPLC ScadaBR Cross-site Scripting Vulnerability
- Added to KEV
2025-11-28- Federal due date
2025-12-19- Vendor
- OpenPLC
- Product
- ScadaBR
- EPSS
- 92.0th percentile (score 0.076, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-26829
CISA short 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.