Arbitrary file upload in Linux Linux_kernel
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.
Vulnerability class: Unrestricted File Upload
EPSS: 0.394 (98.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux Linux_kernel
- Microsoft Windows
- Scadabr
- N/a — versions n/a
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
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.
Public proof-of-concept exploits
References
- cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (Exploit, x_refsource_MISC, Broken Link, Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Issue Tracking, Patch)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2021-26828?
- CVE-2021-26828 is a high-severity vulnerability in Linux Linux_kernel, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2021-06-11.
- How severe is CVE-2021-26828?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2021-26828 known to be exploited?
- Yes. CVE-2021-26828 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-12-03), indicating it is being actively exploited. 26 public proof-of-concept repositories are indexed.