OpenPLC ScadaBR Cross-site Scripting Vulnerability

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Jun 11, 2021 · Catalog

   Detected

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

2. Nov 28, 2025 · CISA KEV

   Known exploited

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

3. Dec 19, 2025 · CISA KEV

   Remediation due

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

4. Jun 16, 2026 · Catalog

   Updated

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

Affected

• cpe scadabr/scadabrversion unspecified
• vendor OpenPLC ScadaBRversion unspecified

Sources

• CISA KEVConfirmed exploitationCVE-2021-26829

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

  cisa.gov
• CVE.orgVulnerability recordCVE-2021-26829

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2021-26829

  30-day exploitation probability 48.0%

  first.org
• NIST NVDVulnerability recordCVE-2021-26829

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

  nvd.nist.gov

References

• Vendor Advisory · forum.scadabr.com.br
• CISA note · github.com
• CISA note · nvd.nist.gov
• US Government Resource · cisa.gov
• Third Party Advisory · forescout.com
• Exploit · youtu.be