Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-26828

CVE-2021-26828HIGH

n/a n/a — OpenPLC ScadaBR

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  H  H  H    8.8   .3936   98.6   YES

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Feb 5   Reserved by mitre
  Jun 11  Published (CNA: mitre)
  Dec 3   Added to CISA KEV, remediation due 2025-12-24

CWE-434 · CNA: mitre · CVSS v3.1 · 5 references · KEV due December 24, 2025

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
February 5, 2021	Reserved	Reserved by mitre
June 11, 2021	Published	Published (CNA: mitre)
December 3, 2025	KEV ADDED	Added to CISA KEV, remediation due 2025-12-24

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-434

References (5)

http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 [x_refsource_MISC]
http://packetstormsecurity.com/files/162564/ScadaBR-1.0-1.1CE-Linux-Shell-Upload.html [x_refsource_MISC]
https://github.com/SCADA-LTS/Scada-LTS/pull/2174 [issue-tracking]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26828 [government-resource]
https://youtu.be/k1teIStQr1A [x_refsource_MISC]

Authoritative record: CVE-2021-26828 at cve.org

Weaknesses: CWE-434

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-26828 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.