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CVE-2021-26829 (GCVE-0-2021-26829)

Vulnerability from cvelistv5 – Published: 2021-06-11 11:05 – Updated: 2025-12-02 04:56
VLAI CISA Previdian
Summary
OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored XSS via system_settings.shtm.
SSVC
Exploitation: active Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-01 00:00 UTC
CWE
  • n/a
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2021-26829

Status: Confirmed

Status Updated: 2025-11-28 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2025-11-28
Asserted: 2025-11-28

Scope
Notes: KEV entry: OpenPLC ScadaBR Cross-site Scripting Vulnerability | Affected: OpenPLC / ScadaBR | Description: OpenPLC ScadaBR contains a cross-site scripting vulnerability via system_settings.shtm. | 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. | Due date: 2025-12-19 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/SCADA-LTS/Scada-LTS/pull/3211 ; https://nvd.nist.gov/vuln/detail/CVE-2021-26829

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev


Details
Cwes CWE-79
Feed CISA Known Exploited Vulnerabilities Catalog
Product ScadaBR
Due Date 2025-12-19
Date Added 2025-11-28
Vendorproject OpenPLC
Vulnerabilityname OpenPLC ScadaBR Cross-site Scripting Vulnerability
Knownransomwarecampaignuse Unknown

References

Created: 2026-02-02 13:24 UTC | Updated: 2026-02-06 07:53 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2021-26829

Status: Confirmed

Status Updated: 2026-06-01 10:45 UTC

Exploited: Yes


Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01

Scope
Notes: KEVIntel entry: OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored XSS via system_settings.shtm. | Affected: OpenPLC / ScadaBR | CVSS: 5.4 (MEDIUM) | EPSS: 0.4805 | Used in malware: unknown | Not yet in CISA KEV: False

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel


Details
Feed KEVIntel (kevintel.com)
Title OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored XSS via system_settings.shtm.
Vendor OpenPLC
Product ScadaBR
Added Date 2026-06-01T10:45:14.727Z
Cvss Score 5.4
Epss Score 0.4805
Cvss Severity MEDIUM
Epss Percentile 0.98709
Used In Malware unknown
Ahead Of Cisa Kev
{
  "count": 1,
  "unit": "day"
}
Not Yet In Cisa Kev False

References

Created: 2026-06-19 12:42 UTC | Updated: 2026-06-19 12:42 UTC
Show details on NVD website

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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