CVE-2026-110970 in Płatnik
Summary
by MITRE • 10/30/2026
Płatnik uses HTTP protocol to download updates, libraries and support files. It allows an attacker to conduct a Man-In-The-Middle attack, obtain transmitted data and replace the original files with their own.
This issue was fixed in metric 242 in version 10.02.002.
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Analysis
by VulDB Data Team • 10/30/2026
The vulnerability identified within the Płatnik software ecosystem stems from a fundamental lack of transport layer security during critical system operations. Specifically, the application utilizes unencrypted HTTP protocol to retrieve essential updates, libraries, and support files required for its continued functionality. This architectural decision creates a significant attack surface by allowing network traffic containing sensitive configuration data or executable code to traverse in plaintext. In environments where Płatnik is deployed, such as government agencies or financial institutions handling taxpayer information, the transmission of these components over an insecure channel exposes them to interception and manipulation by malicious actors positioned within the same network segment or at intermediate routing points.
The core technical flaw lies in the absence of integrity verification and confidentiality mechanisms for remote resource retrieval. By relying solely on HTTP without implementing cryptographic signatures or certificate-based validation, the software fails to authenticate the source of the downloaded files. This deficiency enables a classic Man-In-The-Middle attack scenario where an adversary can intercept the communication stream between Płatnik and its update servers. The attacker is not limited to passive eavesdropping; they possess the capability to actively modify the data in transit. By replacing legitimate libraries or support files with maliciously crafted alternatives, the attacker can inject arbitrary code into the application environment without triggering standard integrity checks that are absent from the download process.
The operational impact of this vulnerability is severe and multifaceted. If an attacker successfully replaces a library file with a compromised version, they effectively achieve remote code execution within the context of the Płatnik application. This can lead to full system compromise, allowing the extraction of sensitive taxpayer data stored or processed by the software. Furthermore, because these files are often loaded at startup or during critical processing phases, the malicious payload may execute before any user interaction occurs, bypassing many behavioral detection mechanisms. The integrity of the entire tax administration workflow is undermined as attackers could alter calculation logic, inject backdoors for persistent access, or disrupt service availability by corrupting essential components.
From a classification perspective, this vulnerability aligns with CWE-319, which denotes the use of cleartext protocol without integrity checks and cryptographic protection to prevent tampering. It also maps directly to MITRE ATT&CK technique T1072, specifically sub-technique 002 for Software Deployment, where attackers install malicious software or updates through compromised channels. The lack of secure update verification is a common pitfall in legacy enterprise applications that prioritize backward compatibility over modern security standards such as TLS with mutual authentication and code signing requirements.
To mitigate this risk, immediate remediation involves upgrading to version 10.02.002 or later, where metric 242 addresses the underlying issue by enforcing secure communication channels for all external resource downloads. Organizations should ensure that their network infrastructure supports modern TLS versions and validates server certificates properly during update processes. Additionally, implementing application-level integrity checks using digital signatures provided by the vendor can provide an additional layer of defense against tampered files even if transport encryption is compromised in other contexts. Regular monitoring of software supply chain security practices and enforcing strict policies on third-party component updates are essential steps to prevent similar vulnerabilities from being exploited in future versions or related systems within the ecosystem.