HIGH CISA KEV

CVE-2021-26828

CVSS v3

8.8

HIGH

EPSS Score

80.0%

exploit probability

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

Description

OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows remote authenticated users to upload and execute arbitrary JSP files via view_edit.shtm.

CISA Known Exploited Vulnerability

Date Added
12/3/2025
Patch Due Date
12/24/2025
Ransomware Use
Unknown

Technical details

Published
6/11/2021

Frequently asked questions

What is CVE-2021-26828?

OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows remote authenticated users to upload and execute arbitrary JSP files via view_edit.shtm.

Is CVE-2021-26828 actively exploited?

Yes. CVE-2021-26828 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 12/24/2025.

What is the CVSS score for CVE-2021-26828?

CVE-2021-26828 has a CVSS v3 base score of 8.8 (HIGH severity).

Is CVE-2021-26828 affecting your environment?

Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.

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