CVE detail
CVE-2021-26829: OpenPLC ScadaBR Cross-site Scripting Vulnerability
Source: CISA Known Exploited Vulnerabilities catalog · back to feed
Vendor / product
OpenPLC · ScadaBR
- Date added (KEV)
- Nov 28, 2025
- CISA due date
- Dec 19, 2025
- Ransomware campaign use
- Unknown
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.
Scorifya interpretation
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Plain English
Technical detail
From CISA
OpenPLC ScadaBR contains a cross-site scripting vulnerability via system_settings.shtm.
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 ; https://nvd.nist.gov/vuln/detail/CVE-2021-26829
See what attackers can see on your domain
This vulnerability is on CISA's Known Exploited Vulnerabilities list, so it is being exploited in the wild right now. Scorifya can't test for OpenPLC directly, but in about 30 seconds it shows what your own domain exposes publicly across TLS, security headers, DNS, and cookies: the surface attackers probe first.
SOC 2 compliance
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See Scorifya Controls →References
- http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4Vendor Advisory
- http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4Vendor Advisory
- https://youtu.be/Xh6LPCiLMa8ExploitThird Party Advisory
- https://youtu.be/Xh6LPCiLMa8ExploitThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26829US Government Resource
Other recent CVEs from OpenPLC
- CVE-2021-26828ScadaBR, OpenPLC ScadaBR Unrestricted Upload of File with Dangerous Type Vulnerability