CVE-2021-26829 KEV
5.4
MEDIUM · CVSS 3.1 · EPSS 48.1% (pctl 99)
Patch first
On CISA KEV — known exploited in the wild, due 2025-12-19.
Description
OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored XSS via system_settings.shtm.
Scoring
| CVSS | 5.4 (MEDIUM, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| EPSS | 48.05% — more likely to be exploited than 99% of all CVEs |
| Weakness | CWE-79 |
| On CISA KEV | yes — remediate by 2025-12-19 |
| Public exploit | none known |
| Published | 2021-06-11 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | OpenPLC ScadaBR Cross-site Scripting Vulnerability |
|---|---|
| Added | 2025-11-28 |
| Due | 2025-12-19 |
| Vendor / product | OpenPLC / ScadaBR |
| Ransomware use | none reported |
Affected (3)
| Vendor | Product |
|---|---|
| linux | linux kernel |
| microsoft | windows |
| scadabr | scadabr |
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/
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