EUVD-2026-13661Severity by source
AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionGitHub Advisory
Greenshot is an open source Windows screenshot utility. Versions 1.3.312 and below have untrusted executable search path / binary hijacking vulnerability that allows a local attacker to execute arbitrary code when the affected Windows application launches explorer.exe without using an absolute path. The vulnerable behavior is triggered when the user double-clicks the application’s tray icon, which opens the directory containing the most recent screenshot captured by the application. By placing a malicious executable with the same name in a location searched prior to the legitimate Windows binary, an attacker can gain code execution in the context of the application. This issue did not have a patch at the time of publication.
AnalysisAI
Greenshot versions 1.3.312 and earlier contain an untrusted executable search path vulnerability (CWE-426) that allows local attackers with high privileges to achieve arbitrary code execution by hijacking the explorer.exe binary launch. When a user double-clicks the Greenshot tray icon to open the screenshot directory, the application launches explorer.exe using a relative path rather than an absolute path, enabling an attacker to plant a malicious executable in a prioritized search location. This vulnerability had no patch available at the time of publication and represents a real privilege escalation and code execution risk requiring immediate user action.
Technical ContextAI
Greenshot (cpe:2.3:a:greenshot:greenshot:*:*:*:*:*:*:*:*) is an open-source Windows screenshot utility that provides system tray integration and quick directory access functionality. The vulnerability stems from CWE-426 (Untrusted Search Path), a classic Windows binary hijacking issue where an application fails to use fully qualified absolute paths when launching external executables. When Greenshot's tray icon is activated, the application calls explorer.exe without specifying its full path (typically C:\Windows\explorer.exe), instead relying on the Windows PATH environment variable for resolution. An attacker can exploit the predictable search order by placing a malicious explorer.exe in a directory that appears earlier in PATH—such as the current working directory or user-writable system directories—causing the system to execute the attacker's binary instead of the legitimate Windows system executable. This is a well-known attack vector on Windows systems where user-controlled directories precede system directories in the PATH variable.
RemediationAI
Users should immediately cease use of Greenshot versions 1.3.312 and earlier, or check the official GitHub repository and security advisory at https://github.com/greenshot/greenshot/security/advisories/GHSA-f8v9-7fph-fr2j for available patch versions released after this CVE publication. If a patched version is available, upgrade to the latest release immediately. For users unable to upgrade, mitigate risk by disabling the tray icon double-click functionality if possible through application settings, avoiding use of Greenshot in multi-user environments, or restricting screenshot directory access to prevent attacker placement of malicious executables. Additionally, ensure the Windows PATH environment variable does not include user-writable directories before system directories, and implement filesystem protections to prevent unauthorized executable placement in directories that precede system paths. Consider using alternative screenshot utilities that do not exhibit this vulnerability.
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External POC / Exploit Code
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