CVE-2021-26828OpenPLC ScadaBR Unrestricted Upload of File with Dangerous Type Vulnerability

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.

8.8 HIGHEPSS 39.09%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 03:43 UTC

OverviewCVSS details

8.8HIGHCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Jun 11, 2021
Assigner: mitre

Affected

scadabr (scadabr)

Versions: through 0.9.1 · through 1.12.4

Exploitation

Public exploit: Yes · 3 references
CISA KEV: Listed · Dec 3, 2025
KEV due date: Dec 24, 2025
Ransomware use: Unknown
SSVC: Exploitation active · Automatable no · Impact total

EPSS · FIRST, scored Nov 7

39.09%chance of exploitation in 30 days

Higher than 98.60% of CVEs

CVSS 3.1 · NVD

8.8High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 2.0 · NVD

6.5Medium

AV:N/AC:L/Au:S/C:P/I:P/A:P

Attack vector: Network
Attack complexity: Low
Authentication: Single
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
8.8	HIGH	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5	MEDIUM	2.0NVD	AV:N/AC:L/Au:S/C:P/I:P/A:P

CISA required action

⚡ Known exploited · remediation due Dec 24, 2025

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Details

CVE ID: CVE-2021-26828
Status: Analyzed
Assigner (CNA): mitre
Published: Jun 11, 2021
Last modified: 2026-06-17 03:43 UTC
Weaknesses: CWE-434

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 10:39 UTC.