What is CVE-2021-26829?

CVE-2021-26829 is a vulnerability in N/a. Published 2021-06-11.

Is CVE-2021-26829 known to be exploited?

Yes. CVE-2021-26829 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-11-28), indicating it is being actively exploited. 1 public proof-of-concept repositories are indexed.

Vulnerability in N/a

CVE-2021-26829

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

EPSS: 0.076 (92.0th percentile) — read the EPSS interpretation.

Affected products

N/a — versions n/a

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2025-11-28. 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: 2025-12-19.

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

ARPSyndicate/cve-scores

References

youtu.be/Xh6LPCiLMa8 (x_refsource_MISC)
forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 (x_refsource_MISC)

Frequently asked questions

What is CVE-2021-26829?: CVE-2021-26829 is a vulnerability in N/a. Published 2021-06-11.
Is CVE-2021-26829 known to be exploited?: Yes. CVE-2021-26829 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-11-28), indicating it is being actively exploited. 1 public proof-of-concept repositories are indexed.