CVE-2021-26829
Cross-site Scripting — is CVE-2021-26829real, exploitable, or a false positive? Here's the community ground truth.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored XSS via system_settings.shtm.
NVD only has a brief summary for this one — the community fills in the real-world detail below.
References
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Community ground truth
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Practitioners rate this higher than its CVSS — treat with extra caution.
Field notes & remediation
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- 0
OpenPLC ScadaBR Cross-site Scripting Vulnerability — OpenPLC ScadaBR contains a cross-site scripting vulnerability via system_settings.shtm. Listed in the CISA KEV catalog (added 2025-11-28) — confirmed exploited in the wild, not theoretical. FIRST EPSS puts the chance of exploitation in the next 30 days at ~48%. Treat it as real and prioritize remediation over triage.
- 0
Required action for OpenPLC ScadaBR: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA set a federal remediation due date of 2025-12-19. After patching, verify the vulnerable path is no longer reachable before closing the finding.
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Same weakness — CWE-79 · Cross-site Scripting.
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