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The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added multiple vulnerabilities affecting OpenPLC ScadaBR to its Known Exploited Vulnerabilities (KEV) catalog, highlighting the active exploitation risk these flaws pose to federal and private sector networks. The most recent addition is CVE-2021-26828, an unrestricted file upload vulnerability that allows remote authenticated users to upload and execute arbitrary JSP files on both Linux and Windows versions of OpenPLC ScadaBR. An additional vulnerability, CVE-2021-26829, a cross-site scripting (XSS) flaw, was also recently added to the catalog, impacting similar versions of the software. CISA has mandated that federal agencies remediate these vulnerabilities by December 24, 2025, in accordance with Binding Operational Directive 22-01, and strongly encourages private organizations to do the same to mitigate the risk of exploitation.
These vulnerabilities are considered significant attack vectors for malicious cyber actors, as they can enable remote code execution and compromise of industrial control systems. The KEV catalog serves as a prioritized list for vulnerability management, and CISA's advisories stress the importance of timely remediation to protect critical infrastructure. Organizations are urged to review the KEV catalog and address these vulnerabilities promptly to reduce their exposure to active threats targeting OpenPLC ScadaBR deployments.
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Under Binding Operational Directive 22-01, CISA required Federal Civilian Executive Branch agencies to remediate the newly listed OpenPLC ScadaBR vulnerability by December 24, 2025. CISA also urged non-federal organizations to review and address KEV-listed vulnerabilities.
CISA added CVE-2021-26828, an unrestricted file upload vulnerability affecting OpenPLC ScadaBR, to its Known Exploited Vulnerabilities catalog after observing evidence of active exploitation. The agency said the flaw poses significant risk and should be prioritized for remediation.
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CISA has updated its Known Exploited Vulnerabilities (KEV) Catalog to include CVE-2021-26829, a cross-site scripting (XSS) vulnerability affecting OpenPLC ScadaBR. This vulnerability allows attackers to exploit the `system_settings.shtm` component, posing a significant risk to organizations using this product. The update was reflected in both the official KEV data repository and a public CISA advisory, which highlights the active exploitation of this flaw and the need for immediate mitigation. Federal Civilian Executive Branch (FCEB) agencies are required by Binding Operational Directive (BOD) 22-01 to remediate this vulnerability by the specified due date. CISA also strongly encourages all organizations, not just federal agencies, to prioritize remediation of vulnerabilities listed in the KEV Catalog to reduce exposure to cyberattacks. The advisory provides references for further technical details and mitigation guidance, emphasizing the ongoing threat posed by known exploited vulnerabilities in widely used industrial control systems.
Jun 29, 2026
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added CVE-2021-26829, a cross-site scripting (XSS) vulnerability in OpenPLC ScadaBR, to its Known Exploited Vulnerabilities (KEV) catalog following evidence of active exploitation. This flaw affects OpenPLC ScadaBR through version 1.12.4 on Windows and 0.9.1 on Linux, specifically via the `system_settings.shtm` component. The vulnerability allows attackers to manipulate the HMI login page and system settings, potentially disabling logs and alarms, which could have significant operational impacts on industrial control systems. Recent reports indicate that the pro-Russian hacktivist group TwoNet exploited this vulnerability against a honeypot mimicking a water treatment facility. The attackers gained initial access using default credentials, established persistence by creating a new user account, and then leveraged CVE-2021-26829 to deface the HMI interface and disrupt system monitoring. CISA's alert underscores the ongoing risk to industrial environments and the need for immediate remediation of affected OpenPLC ScadaBR installations.
Jun 29, 2026
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has expanded its Known Exploited Vulnerabilities (KEV) Catalog by adding five new security flaws that are currently under active exploitation. The vulnerabilities include CVE-2021-21311 affecting Adminer, CVE-2025-20352 impacting Cisco IOS and IOS XE, CVE-2025-10035 in Fortra GoAnywhere MFT, CVE-2025-59689 in Libraesva Email Security Gateway, and CVE-2025-32463 in Sudo. The Adminer flaw is a Server-Side Request Forgery (SSRF) vulnerability that allows attackers to manipulate URL parameters, potentially enabling unauthorized access to internal resources and facilitating lateral movement within networks. The Cisco IOS and IOS XE vulnerability is a stack-based buffer overflow in the SNMP subsystem, which can be exploited by sending crafted SNMP packets, leading to denial of service or remote code execution as root, depending on attacker privileges. Fortra GoAnywhere MFT is affected by a critical deserialization vulnerability in its License Servlet, which could allow attackers to execute arbitrary code. Libraesva ESG suffers from a command injection vulnerability, and Sudo is impacted by a flaw involving the inclusion of functionality from an untrusted control sphere. CISA’s Product Security Incident Response Team (PSIRT) has confirmed that these vulnerabilities are being actively exploited in the wild. The addition of these flaws to the KEV Catalog is based on credible evidence of exploitation, and CISA has issued a Binding Operational Directive (BOD) 22-01 requiring Federal Civilian Executive Branch (FCEB) agencies to remediate these vulnerabilities by specified deadlines. The directive aims to reduce significant risk to federal networks, but CISA also strongly urges all organizations, not just federal agencies, to prioritize remediation of these vulnerabilities as part of their vulnerability management programs. The vulnerabilities span a range of critical systems, including database management tools, network operating systems, email security gateways, and managed file transfer platforms, highlighting the broad attack surface targeted by malicious actors. The Adminer SSRF vulnerability, with a CVSS score of 7.2, affects versions 4.0.0 to just before 4.7.9, while the Cisco IOS/IOS XE flaw, with a CVSS score of 7.7, impacts all devices with SNMP enabled. The Fortra GoAnywhere MFT vulnerability is rated as critical with a CVSS score of 10.0, underscoring the urgency of remediation. CISA’s ongoing updates to the KEV Catalog reflect the evolving threat landscape and the need for organizations to remain vigilant against actively exploited vulnerabilities. Organizations are encouraged to consult the KEV Catalog regularly and implement timely patches to mitigate the risk of compromise. The inclusion of these vulnerabilities in the KEV Catalog serves as a warning to both public and private sector entities about the heightened risk posed by these flaws. Failure to address these vulnerabilities could result in significant operational disruptions or unauthorized access to sensitive systems. CISA’s alert emphasizes the importance of proactive vulnerability management and cross-sector collaboration to defend against active cyber threats.
Jun 29, 2026