medium5.4Known exploited
CVE-2021-26829
OpenPLC ScadaBR Cross-site Scripting Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2025-11-28. Federal due date: 2025-12-19.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Impact
OpenPLC ScadaBR contains a cross-site scripting vulnerability via system_settings.shtm.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Scadabr | Scadabr | through 0.9.1 through 1.12.4 |
Weakness classification
References
- NVD record
- CVE.org record
- CISA KEV catalog
- 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/