Description

Uncaught exception in .NET allows an authorized attacker to elevate privileges locally.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.8",
  "pubDate": "2026-08-11T17:18:44.817Z",
  "pubdate": "2026-08-11T17:18:44.817Z",
  "executiveSummary": "An elevation of privilege vulnerability exists within .NET due to an uncaught exception handling flaw. This security defect allows an authorized local attacker to escalate their execution privileges on the target system. The vulnerability affects systems running the vulnerable .NET runtime where improper exception management creates an insecure execution state. The risk implication involves unauthorized access escalation, potentially enabling a malicious actor with initial low-privileged access to execute operations or access resources restricted to higher-privilege contexts. Exploitation of this vulnerability requires local access to the affected system and prior authorization or execution capabilities within the local environment. No remote exploitation vector is indicated by the vulnerability characteristics, limiting the attack surface strictly to local threat actors capable of triggering the specific unhandled exception condition within the vulnerable component.",
  "technicalDetails": "The root cause of the vulnerability stems from improper exception handling within the .NET runtime environment, specifically manifesting as an uncaught exception that fails to securely transition execution context upon encountering runtime anomalies. When the application or runtime encounters the specific unhandled exception state, it fails to terminate execution safely or sanitize the environment, leaving resources or execution pathways in a vulnerable state. The vulnerable component resides within the .NET framework's exception handling mechanisms responsible for managing runtime errors and process termination. Exploitation of this vulnerability requires the attacker to be authenticated locally on the target system with the capability to execute code or interact with the vulnerable .NET application. The attack flow initiates when the local attacker deliberately triggers the uncaught exception condition. Due to the lack of proper defensive exception containment, the unhandled exception exposes execution flaws or logic oversights within the local process boundary. An authorized attacker leverages this anomalous state to manipulate local system resources, resulting in a successful local elevation of privileges. The post-exploitation impact includes the potential acquisition of administrative or elevated execution rights on the local operating system, allowing the attacker to bypass standard security controls, modify system configurations, access sensitive data, or install persistent payloads within the local environment. Network exposure is non-existent as the attack vector is strictly local, requiring direct interaction with the vulnerable .NET runtime instance."
}