CVE-2021-26829
CVSS v3
5.4
MEDIUM
EPSS Score
13.6 %
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 stored XSS via system_settings.shtm.
CISA Known Exploited Vulnerability
- Date Added
- 2025-11-28
- Patch Due Date
- 2025-12-19
- Ransomware Use
- Unknown
Technical details
- Published
- 2021-06-11
Frequently asked questions
What is 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.
Is CVE-2021-26829 actively exploited?
Yes. CVE-2021-26829 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 2025-12-19.
What is the CVSS score for CVE-2021-26829?
CVE-2021-26829 has a CVSS v3 base score of 5.4 (MEDIUM severity).
Is CVE-2021-26829 affecting your environment?
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