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CVE-2021-26828

OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows remote authenticated...

8.8 HighIn KEVPublic exploit

CVE-2021-26828 is a high vulnerability (CVSS 8.8) in Openplc Scadabr, published June 11, 2021. CISA lists it as known to be exploited, since December 3, 2025. EUVD reports exploitation since December 3, 2025. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 39.1%, the 98th percentile. No source names a fixed version.

What does this mean?
Severity
8.8 HighCVSS 3.1, NVD
Exploit chance
39.1%EPSS, 98th percentile
Exploitation
ExploitedCISA KEV,
Fixed in
No fix listedNo source names one

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

39.1%Up 34.6 points since Jun 12, 2021
90%50%10%1%

Affected products

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubhev0x/CVE-2021-26828_ScadaBR_RCE2021-03-31
PoC in GitHubridpath/CVE-2021-26828-Ultimate2025-05-30
PoC in GitHubh002733/CVE-2021-268282026-10-09

What each source reports

NVD Score used8.8

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.

Record
CVE-2021-26828
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
6.5 MediumAV:N/AC:L/Au:S/C:P/I:P/A:P
Weakness
CWE-434
Updated
2026-11-02
CVE List8.8

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.

Record
CVE-2021-26828
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-434
Updated
2026-11-02
EUVDEUVD-2021-136138.8

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.

Record
EUVD-2021-13613
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-j87g-5g8x-jjxc8.8

OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows remote authenticated...

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.

Record
GHSA-j87g-5g8x-jjxc
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-434
Updated
2026-11-02
CISA KEVNo score

OpenPLC ScadaBR Unrestricted Upload of File with Dangerous Type Vulnerability

OpenPLC ScadaBR contains an unrestricted upload of file with dangerous type vulnerability that allows remote authenticated users to upload and execute arbitrary JSP files via view_edit.shtm.

Record
CVE-2021-26828
Weakness
CWE-434
Updated
2026-11-02

History

History
RecordedChangedSources
exploitation, exploits
first indexedCVE List, EUVD, GitHub Advisories, CISA KEV, NVD, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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