CVE-2026-0392 in eParakstītājs
Summary
by MITRE • 08/03/2026
eParakstītājs 3.0 for Windows before version 1.10.0 retrieves and executes its automatic updates over a channel that is not authenticated or integrity-protected. On each launch the application fetches an update descriptor (XML) over TLS but accepts any TLS certificate (a permissive TrustManager and a HostnameVerifier that always returns true), does not verify any digital signature on the update descriptor, and does not verify the Authenticode signature or a checksum of the downloaded installer before running it. A man-in-the-middle attacker able to redirect www.eparaksts.lv can serve a crafted update descriptor pointing to an attacker-controlled executable, which the client downloads and executes, resulting in arbitrary code execution on the victim host.
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Analysis
by VulDB Data Team • 08/03/2026
The eParakstītājs 3.0 for Windows vulnerability represents a critical security flaw in the software's update mechanism that fundamentally undermines the integrity and authenticity of the application's upgrade process. This vulnerability exists in versions prior to 1.10.0 and creates a significant attack surface by implementing a trust model that completely disregards cryptographic verification and authentication protocols. The software's update system fetches XML descriptor files over Transport Layer Security connections but fails to enforce proper certificate validation, accepting any TLS certificate presented by the server due to a permissive TrustManager implementation and a HostnameVerifier that consistently returns true regardless of the actual hostname. This design flaw directly violates security best practices and creates an environment where attackers can manipulate the update process without detection or resistance from the client application.
The technical exploitation of this vulnerability occurs through a man-in-the-middle attack vector that specifically targets the domain www.eparaksts.lv, which serves as the legitimate update endpoint for the software. When the application launches, it automatically attempts to retrieve update information from this domain, but due to the lack of certificate verification and signature validation, an attacker who can redirect DNS queries or intercept network traffic can serve malicious update descriptors that point to attacker-controlled executables. The vulnerability extends beyond simple certificate validation issues as it also fails to verify digital signatures on the XML update descriptors themselves, meaning there is no cryptographic proof that the updates originated from legitimate sources. Additionally, the software does not perform checksum verification or Authenticode signature validation on the downloaded installers before executing them, creating multiple layers of potential compromise where an attacker can inject malicious code at various stages of the update process.
The operational impact of this vulnerability is severe and directly translates to arbitrary code execution capabilities for attackers who can position themselves in the network path between the client and the update server. This represents a critical escalation from a simple network interception attack to a full system compromise opportunity, as the software will execute any installer that the malicious update descriptor points to without verification. The vulnerability affects all users of affected versions regardless of their security awareness or system configurations, as the exploitation occurs entirely within the application's automated update process. This creates a persistent threat vector that can be exploited repeatedly whenever users launch the application, making it particularly dangerous for environments where automatic updates are enabled and users do not manually verify software integrity.
The vulnerability architecture aligns with several established security frameworks including CWE-295 which addresses improper certificate validation and CWE-347 which covers flawed cryptographic implementations. From an ATT&CK perspective, this vulnerability maps to T1059 for execution through malicious updates and T1566 for initial access via the update mechanism. The flaw represents a fundamental failure in secure software design principles where the application assumes trust in network communications without implementing proper verification mechanisms. Organizations using eParakstītājs 3.0 for Windows should immediately implement mitigations including network-level restrictions to prevent access to the vulnerable update endpoints, DNS hardening to prevent redirection attacks, and manual update procedures until a patched version is deployed. The most effective long-term solution requires the software vendor to implement proper certificate pinning, digital signature verification, and checksum validation before executing any downloaded installers, along with establishing secure communication channels that cannot be easily intercepted or manipulated by adversaries.