OpenPLC ScadaBR Unrestricted Upload of File with Dangerous Type Vulnerability
n/a — n/a
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
39.4%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Published
- Jun 11, 2021
- Modified
- Dec 4, 2025
- Added to KEV
- Dec 3, 2025
- Federal patch due
- Dec 24, 2025
CISA 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.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2021-26828, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2021-26828 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-2021-26828?
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.
How severe is CVE-2021-26828?
CVE-2021-26828 has a CVSS base score of 8.8 out of 10 (CVSS 3.1).
Is CVE-2021-26828 actively exploited in the wild?
Yes. CVE-2021-26828 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Dec 3, 2025, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2021-26828?
39.4% - meaning FIRST.org's EPSS model estimates a 39.4% probability this vulnerability will be exploited in the wild within 30 days (98% percentile among all scored CVEs).
What type of vulnerability is CVE-2021-26828?
CVE-2021-26828 is classified under CWE-434 (CWE-434 Unrestricted Upload of File with Dangerous Type).
Cross-checked against
Impactr finds and proves whether CVE-2021-26828 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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