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5.4
MEDIUM CVSS 3.1
CVE-2021-26829
OpenPLC ScadaBR Unauthenticated Stored Cross-Site Scripting Vulnerability
Description

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

INFO

Published Date :

June 11, 2021, 12:15 p.m.

Last Modified :

Nov. 21, 2024, 5:56 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2021-26829 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Openplcproject scadabr
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 LOW [email protected]
CVSS 3.1 MEDIUM [email protected]
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-26829.

URL Resource
http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 Vendor Advisory
https://youtu.be/Xh6LPCiLMa8 Exploit Third Party Advisory
http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 Vendor Advisory
https://youtu.be/Xh6LPCiLMa8 Exploit Third Party Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-26829 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-26829 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-26829 vulnerability anywhere in the article.

  • europa.eu
Cyber Brief 25-11 - October 2025

Cyber Brief (October 2025)November 3, 2025 - Version: 1TLP:CLEARExecutive summaryWe analysed 281 open source reports for this Cyber Brief1.Relating to cyber policy and law enforcement, the European Co ... Read more

Published Date: Nov 01, 2025 (2 days, 22 hours ago)
  • CybersecurityNews
Pro-Russian Hacktivist Attacking OT/ICS Devices to Steal Login Credentials

A newly identified pro-Russian hacktivist group has successfully infiltrated operational technology and industrial control systems belonging to critical infrastructure organizations, employing sophist ... Read more

Published Date: Oct 14, 2025 (3 weeks ago)
  • Daily CyberSecurity
Pro-Russian Hacktivist Group TwoNet Exposed for Fabricating Critical Infrastructure Attacks to Boost Reputation

Forescout Research has uncovered a disturbing new tactic among pro-Russian hacktivists — fabricating real-world critical infrastructure attacks to inflate their reputation. In a recent case, a newly f ... Read more

Published Date: Oct 13, 2025 (3 weeks, 1 day ago)
  • The Register
Pro-Russia hacktivist group dies of cringe after falling into researchers' trap

Security researchers say they duped pro-Russia cybercriminals into targeting a fake critical infrastructure organization, which the crew later claimed - via their Telegram group - to be a real-world a ... Read more

Published Date: Oct 10, 2025 (3 weeks, 4 days ago)
  • BleepingComputer
Hacktivists target critical infrastructure, hit decoy plant

A pro-Russian hacktivist group called TwoNet pivoted in less than a year from launching distributed denial-of-service (DDoS) attacks to targeting critical infrastructure. Recently, the threat actor cl ... Read more

Published Date: Oct 09, 2025 (3 weeks, 5 days ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2021-26829 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4
    Added Reference https://youtu.be/Xh6LPCiLMa8
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Jun. 21, 2021

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Added CVSS V2 NIST (AV:N/AC:M/Au:S/C:N/I:P/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
    Changed Reference Type http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 No Types Assigned http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 Vendor Advisory
    Changed Reference Type https://youtu.be/Xh6LPCiLMa8 No Types Assigned https://youtu.be/Xh6LPCiLMa8 Exploit, Third Party Advisory
    Added CWE NIST CWE-79
    Added CPE Configuration OR *cpe:2.3:a:openplcproject:scadabr:*:*:*:*:*:linux:*:* versions up to (including) 0.9.1 *cpe:2.3:a:openplcproject:scadabr:*:*:*:*:*:windows:*:* versions up to (including) 1.12.4
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 5.4
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 3.5
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.30 }} 0.05%

score

0.53281

percentile