# CVE-2021-26829

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

- Page: https://www.vulneraibility.com/cve/CVE-2021-26829
- CVSS: 5.4
- Known exploited: yes, in CISA KEV since 2025-11-28; CISA due date 2025-12-19
- EPSS: 48.05%
- CISA SSVC: exploitation active, automatable no, technical impact partial (assessed 2025-12-01)
- Weakness: CWE-79
- Published: 2021-06-11

## Affected

- scadabr:scadabr

## References

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

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.