CVE-2021-26829
Actively exploited. CVE-2021-26829 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-11-28) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
OpenPLC ScadaBR contains a cross-site scripting vulnerability via system_settings.shtm.
CSIRTS triage
- 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.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2021-26829
Get an email if CVE-2021-26829 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2021-26829: OpenPLC ScadaBR Cross-site Scripting Vulnerabilitycisa-kev · 2025-11-28
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2021-26829)