CVE-2021-26828
HighExploitedPublic exploitOpenPLC 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.
Published Jun 11, 2021 · Updated Dec 4, 2025
Key Facts
Patch immediately- CVE-2021-26828 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Scadabr.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 9, 2025. Public exploit code is available.
- EPSS estimates a 39% probability of exploitation in the next 30 days.
- Fixed versions are available, including Scadabr <=0.9.1, Scadabr 0.9.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
39%
Higher than 98.5% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-26828 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Dec 3, 2025 | Dec 24, 2025 | Not reported |
| Industry KEV feed | Oct 9, 2025 | Dec 24, 2025 | Not reported |
| CIRCL KEV | Dec 3, 2025 | Dec 24, 2025 | Not reported |
| ENISA EUVD | Dec 3, 2025 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ScadabrScadabr | See advisory | 0.9.1 |
Patched Releases
Scadabr
<=0.9.1
Timeline
Publicly disclosed
Jun 11, 2021
Added to Industry KEV feed
Oct 9, 2025
Added to CISA KEV
Dec 3, 2025
Added to CIRCL KEV
Dec 3, 2025
Added to ENISA EUVD
Dec 3, 2025
Last updated
Dec 4, 2025
Weakness Type
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
- patchhttps://github.com/SCADA-LTS/Scada-LTS/pull/2174
- exploithttp://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4
- exploithttp://packetstormsecurity.com/files/162564/ScadaBR-1.0-1.1CE-Linux-Shell-Upload.html
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: Scadabr. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 9, 2025.
Yes. It was added on Dec 3, 2025 with a federal remediation due date of Dec 24, 2025.
Public exploit code is available.
Fixed versions are available, including Scadabr <=0.9.1, Scadabr 0.9.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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