Is CVE-2021-26829 actively exploited?

CVE-2021-26829 has no public evidence of in-the-wild exploitation as of 2025-12-01.

What is the CVSS score for CVE-2021-26829?

CVE-2021-26829 has a CVSS score of 5.4 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Patch guidance is available from scadabr security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-26829.

2 products: scadabr scadabr, scadabr scadabr.

OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored XSS via system_settings.shtm.

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack Vector: network
Complexity: low
Privileges: low
User Action: required
Scope: changed
Confidentiality: low
Integrity: low
Availability: none
Weaknesses: CWE-79 · Cross-site Scripting (XSS)CWE-79 · Cross-site Scripting (XSS)

Primary Vendor: SCADABR
Published: 6/11/2021
Last Modified: 12/1/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.