Description

Untrusted search path in Windows Narrator Braille allows an authorized attacker to elevate privileges locally.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.8",
  "pubDate": "2026-08-11T17:18:04.220Z",
  "pubdate": "2026-08-11T17:18:04.220Z",
  "executiveSummary": "An untrusted search path vulnerability exists in Windows Narrator Braille, which can be exploited by a locally authorized attacker to achieve privilege escalation.\nThe flaw stems from insecure dynamic link library loading or binary resolution within the application search path, allowing malicious actors to plant arbitrary payloads that are subsequently executed with elevated system privileges.\nThe affected product is Windows Narrator Braille. Successful exploitation grants the attacker the ability to execute arbitrary code within the context of a privileged user or service account, compromising the confidentiality, integrity, and availability of the local operating system.\nPrerequisites for this attack include local access to the system and the ability to place a maliciously crafted file into the vulnerable search path.\nThe risk implication is significant as it provides a pathway for local privilege escalation, enabling attackers with standard user access to transition to higher privilege tiers.",
  "technicalDetails": "The vulnerability is classified as an untrusted search path issue residing within the Windows Narrator Braille component. The root cause originates from the application's insecure search logic when resolving external dependencies, such as dynamic link libraries or helper binaries, during execution.\nWhen Windows Narrator Braille initializes or performs specific functional routines, it searches for required binaries or libraries by traversing directories without properly enforcing fully qualified paths. Specifically, the search algorithm may prioritize insecure locations, such as current working directories or user-writable paths, before checking secure system directories.\nAn authorized local attacker exploits this behavior by placing a maliciously crafted dynamic link library or executable matching the expected dependency name into a directory that is evaluated early in the application search path sequence.\nThe attack flow proceeds as follows: First, the attacker identifies the missing or dynamically loaded dependency utilized by Windows Narrator Braille. Second, the attacker plants the malicious payload possessing the target file name into the vulnerable directory location. Third, upon execution or interaction with Windows Narrator Braille by a user or automated routine, the application attempts to load the dependency, inadvertently executing the attacker-supplied payload.\nBecause Windows Narrator Braille may execute with elevated security contexts or system-level permissions, the malicious payload inherits these privileges upon execution. Authentication and privilege requirements mandate that the attacker already possesses local interactive access to the host operating system with permissions to write to the targeted search path location.\nThe network exposure for this vulnerability is strictly local, precluding remote exploitation vectors unless combined with a separate remote access capability. Post-exploitation impact includes arbitrary code execution, persistence mechanisms establishment, and potential complete compromise of the local Windows operating system."
}