What’s Vulnerable › Vulnerabilities

CVE-2021-26829: OpenPLC ScadaBR Cross-site Scripting Vulnerability

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-11-28
• EPSS: 48.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-11 · updated 2026-06-17
• Weakness: CWE-79

Description

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

Affected products

• ScadaBR: through 0.9.1; through 1.12.4

References

• http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4
• https://youtu.be/Xh6LPCiLMa8
• http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4
• https://youtu.be/Xh6LPCiLMa8
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26829
• https://www.forescout.com/blog/anatomy-of-a-hacktivist-attack-russian-aligned-group-targets-otics/

Get alerted when CVE-2021-26829 or the next vulnerability affects your stack