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CVE-2021-26829: OpenPLC ScadaBR Cross-site Scripting Vulnerability

criticalknown exploitedCVE-2021-26829
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
OpenPLC ScadaBR contains a cross-site scripting vulnerability via system_settings.shtm.

CSIRTS triage

vendor: OpenPLCproduct: ScadaBRCross-site scripting
What
OpenPLC ScadaBR contains a cross-site scripting vulnerability via system_settings.shtm.
Who is affected
Users of OpenPLC ScadaBR with the vulnerable version.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest security updates for OpenPLC ScadaBR.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-11-28
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-26829

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-26829coverage & exploitation statusNVD · CVE.org

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